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At least 73 records · Page 4Linked to original sources
PubMed2005

Real-time three-dimensional ultrasound visualization of erection and artificial coitus.

To investigate the feasibility of imaging penile erection and coitus in real time and in three dimensions, a 'Live' three-dimensional (3-D) ultrasound system was used to acquire the volume of interest at 25 Hz from five healthy men. Water baths and gel-made artificial vaginas were devised to facilitate the 3-D scans without the probe being in direct contact with the penis. For the first volunteer scanned with the water bath alone, the penis failed to erect within 30 min. For the other four volunteers, the 'vagina' successfully initiated and maintained the erection and allowed artificial intercourse. Results have shown that the 'Live' 3-D ultrasound and minimally compressive imaging techniques together can offer an objective means for visualizing erection and coitus in spatial totality and temporal reality. They can be further developed to reveal more reliable details about the dynamic morphology, improving scientific understanding of sexual activities and clinical management of related problems.

Coitus↗
PubMedDate not supplied

Coitus interruptus. Considerations as a method of birth control.

Coitus interruptus generally is considered an ineffective form of contraception. No current data exist, however, on the use effectiveness of this method in the United States. This article supports the argument that information on how to use coitus interruptus should be a part of contraceptive counseling, especially for individuals prone to using this method (i.e., individuals inexperienced with contraceptive use and those who have exhausted all other contraceptive choices).

Adolescent↗
PubMed1977

The effect of exercise training on heart rate during coitus in the post myocardial infarction patient.

The effect of interval exercise training on the peak coital heart rate in post myocardial infarction patients was studied. Sixteen men (ages 46-54) underwent a 16-week bicycle ergometer training program 12 to 15 weeks following their first myocardial infarction. Portable ECG tape recorders were used to record the ECG during coitus twice before and twice after the training program. The maximum minute oxygen consumption (VO2max) was measured in each subject during bicycle ergometer ECG examinations before and after the training program. A control group of six post myocardial infarction patients who were not trained was evaluated in the same manner. The exercise-trained group had an average increase in VO2max of 11.5%(2.7 to 3.0 L/min) and an average decrease in peak coital heart rate of 5.5%(127/min to 120/min). The control group demonstrated a 2% increase in VO2max and no significant change in peak coital heart rate. The increase in aerobic capacity (VO2max) and the consequent reduction in peak coital heart rate in our trained group suggests the potential value of exercise training in improving sexual function in the patient with angina during coitus.

Angina Pectoris↗
PubMed2005

Uterine effect of cervical buffeting: role of the cervicouterine reflex in coitus.

OBJECTIVE: To investigate the hypothesis that cervical buffeting during coitus effects reflex relaxation and dilatation of the corpus uteri (CorU) smooth muscle; that mechanism acts to suck the ejected semen into the CorU. STUDY DESIGN: The CorU response to electrical and mechanical stimulation of the CU was recorded in 22 healthy women (mean age, 38.2 +/- 7.6 SD years). Cervical electrical stimulation was effected by an electromyographic needle electrode and mechanical stimulation by pencil electrode. The test was repeated after individual anesthetization of the CU and CorU and after normal saline injection. RESULTS: Slow waves, superimposed or followed by action potentials, were recorded at rest from the CorU electrode. Electrical or mechanical stimulation of the CU effected a significant reduction of the electric wave parameters and pressure in the CorU; this response was reproducible. Separate stimulation of the anesthetized CU or CorU did not evoke the response, while saline infiltration did. CONCLUSION: CU stimulation resulted in diminished CorU electrical activity and pressure; that presumably indicates uterine wall relaxation. Repeated CU buffeting apparently leads to an intermittent uterine pressure decline, with resulting semen siphonage from the vagina to the uterus. Diminished CorU electrical activity and pressure on cervical stimulation or buffeting might be mediated through the cervicouterine inhibitory reflex. This reflex seems to be evoked by penile thrusting during coitus and may prove of diagnostic significance in sexual disorders.

Action Potentials↗
PubMed1989

Coitus during menses. Its effect on endometriosis and pelvic inflammatory disease.

Four hundred ninety-eight consecutive new female patients in a private obstetrics-gynecology practice were asked about their coital habits during menses (SxMs/F = frequent, SxMs/O = occasional, SxMs/N = never) and history of pelvic inflammatory disease (PID). Endometriosis and tubal infertility factor were diagnosed on laparoscopy or laparotomy. The frequency of endometriosis was higher (P less than .05) in patients with coitus during menses (SxMs/F + O) (17.5%) than in the SxMs/N group (10.9%). The frequency of PID was not different between the SxMs/F + O (10.8%) and SxMs/N (9.7%) groups. Thirty-five percent of the infertility patients had a tubal infertility factor. The frequency of tubal infertility factors was higher in the PID group (78.4%) than in the non-PID group (30.4%) (P less than .001). Endometriosis was associated with an increase in tubal infertility factors (47.9% vs. 33.3% in the nonendometriosis group) but to a lesser degree than PID. The frequency of PID in the group with a tubal infertility factor was higher (22.7% vs. no tubal factor, 3.4%) (P less than .001), and the frequency of endometriosis was higher in the group with a tubal infertility factor (19.3% vs. no tubal factor, 11.5%) (P less than .05). Coitus during menses appeared to increase the chances of endometriosis but not of PID. The rate of tubal infertility factors increased in both PID and endometriosis.

Adult↗
PubMed1989

Changes in the pattern of uterine contractility in relationship to coitus during pregnancies at low and high risk for preterm labor.

This is a preliminary, prospective study of uterine contractility in response to sexual intercourse. The study population consisted of 30 pregnant subjects. Group I included 15 women treated for an episode of preterm labor with intravenous and oral tocolysis in this pregnancy, and group II was a matched control group of low-risk volunteers. The availability of home uterine tocodynamometric systems permitted monitoring of uterine contractility for three 60-minute time periods related to coitus. A significant increase in uterine contractility in the immediate postcoital period was observed for the high-risk women, but not for the controls. This increased uterine activity subsided spontaneously within 2-3 hours, returning to baseline. These initial preliminary observations of uterine response to coitus in a home environment are interesting; however, further research is suggested to establish their clinical implications.

Adult↗
PubMed1983

[Accidental urethral rupture during coitus].

Emergency surgery in three cases of accidental urethral rupture during coitus involved suture of the tunica albuginea corpus cavernosum and immediate repair of the urethra under cover of a urethral guide and a cystostomy. The three perfect results obtained, with normal micturition and more particularly normal erections, together with data from reports in the published literature, strongly suggest the need for urgent repair of traumatic lesions of the corpora cavernosae during coitus. The possibility of a urethral rupture makes urgent operation even more essential, before the patient urinates, to avoid transformation of a traumatic hematoma into a urohematoma.

Adult↗
PubMed1995

[Vaginal injuries during coitus: 98 cases].

UNLABELLED: We have undertaken a prospective study of vaginal injuries due to coitus with the aim of evaluating their incidence, risk factors and anatomic lesions. Over a period of 39 months, 98 cases were found, giving a monthly incidence of 2.5. The patients had a mean age of 25 years, were paucipara in more than 50%. Sexual abstience was found in 72 cases with a mean duration of 6 months. This injury occurred more often in gynecological period than in the postpartum (77 cases versus 22). During sexual intercourse the most harmful position was when the patient was in dorsal decubitus with maximum flexion and abduction of the limbs. The vaginal injury was located in the posterior cul de sac in 39 cases and was of 5 cm of length in 56%. Surgical suture was required in 92 out of 98 patients, in combination with local and general antibiotics. CONCLUSION: Vaginal injuries due to coitus are frequent in our practice and they create serious anatomic lesions. So there is a need to precise the etiopathogenicity (hormonal deficiency ?, infections ?, role of the male partner) and to evaluate the long term sequellas.

Adolescent↗
PubMed1998

Sex and the human female reproductive tract--what really happens during and after coitus.

The scientific study of the interaction of human genitals during coitus and after ejaculation with and without female orgasm has always been difficult and controversial with ethical, technical and social problems. The present brief review examines critically the results from these studies. Early observations utilised changes induced in sexually self-aroused subjects or by coitus with artificial (transparent) penes with few objective measurements. These culminated in the synthesis of the useful unitary descriptive, EPOR (excitation, plateau, orgasm, resolution)-model by Masters and Johnson (1966). Later investigations by other workers developed or employed instrumentation to record objectively the changes induced in the motility and pressures of genital muscles, in genital blood flow, in the ion and fluid movements creating the neurogenic transudate of vaginal lubrication, in its pH and pO2 and in the disposition of the ordered spurting ejaculate with subsequent sperm transport. More recently, studies have begun to use endoscopy and ultrasound imaging to picture what really happens especially during penile thrusting. While the newer techniques have often confirmed selected features of the original EPOR model they have also shown that the characterisation of the coital changes just by a unitary model is inappropriate. New observations suggest a plurality in the changes that can occur. Coital mechanisms are dynamic and our investigations and descriptions of them should match their dynamism. The knowledge gained will be more than helpful in the treatment of infertility, genital dysfunctions and disease transmission.

Cervix Uteri↗
PubMed1975

A scanning electron microscopic study of rabbit spermatozoa in the female reproductive tract following coitus.

The surface morphology of rabbit spermatozoa, fixed in situ (female reproductive tract) and prepared for scanning electron microscopy by critical point drying, was studied for as many as 36 hours post coitum. The findings demonstrate that 1) spermatozoa in the reproductive tract following coitus exist as a heterogenous, morphological population and 2) with time, shifts within this population from one predominant morphology to another take place. In the fresh ejaculate, most spermatozoa have intact surfaces free of membranous disruptions. With time, a process of labilization (denudation) of the membranes covering the acrosomal region occurs in a progressively larger proportion of spermatozoa. The labilization originates by a process of vesiculation and/or vacuolation and leads to the appearance of a series of small fenestrations of perforations of the surface membranes. The perforations coalesce, and gradually larger areas of the surface membranes are eroded such that by 15 hours post coitum, the outer acrosomal membrane, as well as other acrosomal areas, are to varying degrees, directly exposed to the uterine milieu. Secretory granules, picked up by cilia and transferred to the spermatozoa become localized over the acrosomal region shortly after coitus. The possible significance of these time-dependent morphological events with the phenomena of capacitation and the "true" and "false" acrosome reactions are discussed.

Acrosome↗
PubMed1986

Oxytocin release during coitus in male and female rabbits: effect of opiate receptor blockade with naloxone.

Blood was collected from freely moving rabbits pretreated with saline or naloxone both before and after coitus. In the males, ejaculation was associated with a marked increase in plasma oxytocin concentrations. In the females, oxytocin release was an all-or-nothing phenomenon-either there was no change in oxytocin or it rose to levels very similar to that found post-ejaculation in the males. Naloxone did not alter the proportion of occasions in which females showed an oxytocin response, nor did it have a significant effect on the levels of oxytocin achieved during coitus in either the male or the female rabbits.

Animals↗
PubMed1977

Coitus-induced release of luteinizing hormone in the proestrous rat: fantasy or fact?

The influences of mating on serum luteinizing hormone (LH) and follicle stimulating hormone (FSH) levels were evaluated in 4-day cyclic proestrous rats of the Wistar strain. Blood samples were collected via guillotine from mated and unmated controls at 1900-2000 h or 2100--2200 h. Serum LH levels were determined by two independent radioimmunoassays. There were no significant differences in LH measurement between assays. At 1900--2000 h, LH levels were high, but not significantly different, in both the mated and unmated control animals. By 2100-2200 h, serum LH concentration had dropped in unmated controls but was significantly elevated in mated animals. There was no significant elevation in FSH either 1900-2000 h or 2100--2200 h on the evening of proestrus. The data indicate that when LH levels are normally high, coitus cannot further potentiate LH release. However, when LH levels are declining, coitus is an effective and adequate stimulus to initiate elevations in serum LH.

Animals↗
PubMed1983

Ovarian and endocrine responses in the cat after coitus.

LH release leading to ovulation was induced in 17 of 29 oestrous periods. The time of ovulation after coitus was determined by histological examination or by observation at laparotomy of ovaries in situ. Histological methods revealed that ovulation was complete in most follicles (9 of 13) at 32 h post coitum and in all follicles that were involved in the ovulatory process by 36 h. When laparotomy was used, no signs of preovulatory change were noted at the first observation time, 22 h post coitum, but in 4 cycles in which the entire process of ovulation was observed, the ovulatory process occurred between 23 and 28 h (3 follicles), 23 and 27 h (2 follicles), 25 and 28 h (3 follicles), and 25 and 29 h (3 follicles) post coitum. The first ovulatory process noted was complete at 25 h post coitum. In cats, LH release continued over a 16-h period before returning to baseline (long surge), values being 616 +/- 180 ng/ml at 1/2 h and 941 +/- 154 ng/ml at 2 h post coitum. In 6 cats the LH release pattern was limited to a 4-h period (short surge), values being 537 +/- 218 ng/ml at 1/2 h and 353 +/- 245 ng/ml plasma at 2 h and basal (49 +/- 18 ng/ml) by 4 h post coitum. Decreased secretion of oestrogen by follicles in animals undergoing ovulation was first observed at 16 h post coitum. It is concluded that coitus induces LH release within minutes in the cat and that ovulation begins about 24 h later and finishes by about 32 h post coitum. Only one coital input can cause LH release for as long as 16-20 h although shorter periods of LH release (4 h or less) can result in ovulation.

Animals↗
PubMed1975

Corpus spongiosum penis pressure and penile muscle activity in the stallion during coitus.

A needle-tipped catheter or subminiature pressure transducer was implanted in the corpus spongiosum penis (CSP) of Shetland Pony stallions to determine pressure during coitus. Electrodes for monitoring the electromyographic (EMG) activity were implanted in the ischiocavernosus (IC) and bulbospongiosus (BS) muscles. The mean peak CSP pressure recorded with the catheter was 762 mm of Hg, and with the subminiature pressure transducer, it was 994 mm of Hg. The simultaneous occurrence of the CSP pressure peaks and bursts of BS muscle activity indicated that these muscles were the likely source of energy for the increased pressures, which were far greater than the systemic blood pressure. This conclusion was further supported by the finding that anesthesia of the BS muscles greatly reduced the CSP pressures of the stallion during attempted coitus.

Animals↗
PubMed1990

Coitus induced changes in oviductal motility & effect of progesterone.

Motility of different oviductal segments of conscious rabbits was recorded through permanently implanted sensors using the technique of impedance plethysmography. The implants were around the oviductal wall and therefore did not obstruct its lumen. Pre-ovulatory ampullary motility was always less than the isthmic motility. Coitus induced ovulation produced a characteristic oviductal motility pattern consisting of (i) initial relaxation of both isthmus and ampulla (4-12 h) followed by (ii) increased isthmic motility in the face of a continually relaxed ampulla (36-48 h), and finally phase (iii) leading to restitution of both ampullary and isthmic motility to the base-line at 72-96 h. Estimation of ova positions indicated the presence of fertilized eggs in the ampulla and ampullo-isthmic junction at 48 h and the ova could come to the end of the isthmic segment only at 72 h or after. Increased isthmic motility thus served to counter the transportation of ova and their retention in the ampulla. Rabbits in which oviducts were not taken out for ova positioning achieved normal pregnancy. Administration of progesterone (im, 2.5 mg) produced complete relaxation of both isthmus and ampulla, did not produce increased isthmic contractility on coitus, accelerated the ovum transport rate and inhibited pregnancy, again emphasising the ova retentive role of oviductal motility.

Animals↗
PubMed1999

Coitus-dependent family planning methods: observations from Bangladesh.

Some coitus-dependent methods of family planning, such as withdrawal, periodic abstinence, and the condom, require male involvement for their use, and using these methods in combination has proved to be sensible. An investigation of why male and female respondents in a survey conducted in Bangladesh often gave conflicting answers about which methods they were currently using, particularly about "traditional" methods and condoms, showed that inconsistency in their reports arose because these methods are used in combination to such an extent that they are difficult to distinguish. In order to obtain reliable responses about these methods, a survey approach different from the long-established one is required.

Adult↗
PubMed1994

[The first coitus as an outcome indicator].

BACKGROUND: For evaluation of the health status in specialized medical disciplines and comparisons in different regions (countries, world-wide comparisons) the World Health Organization recommends and uses so-called indicators. In the sphere of human sexuality the use of such indicators is difficult, because it cannot be assessed by objective data. The purpose of the present study was to assemble information on the time and course of the first sexual intercourse of contemporary Czech girls. METHODS AND RESULTS: A total of 700 Czech girls aged 16-18 years were interviewed; all menstruated already. 344 girls (49.1%) reported that they had heterosexual intercourse: in 24.1% the first intercourse occurred at the age of 15 years and in 75.9% between 16 and 18 years. As to the place where it occurred, in 64% it was the parents' apartment. For the contemporary Czech society it is typical that in cca 20% the place of the first intercourse was a weekend house. In 8.5% of the girls the intercourse was implemented by force or under the influence of abundant alcoholic drinks. As far as prevention of unwanted pregnancy is concerned, in 42.0% no contraception was used, coitus interruptus was practiced in 25.3%--i.e. unreliable contraception in 67.3% of sexual intercourse. A condom was used by 30.4% partners, hormonal birth control only by 2.3% girls. CONCLUSIONS: Information on "outcome indicators" on the time of the first sexual intercourse and the place where it occurred was assembled. The authors recorded also data on the use of force, the influence of alcohol and the use of contraception. These data make it possible to gain an idea on the sexual life during adolescence.

Adolescent↗
PubMed1975

Premarital coitus and commitment among college students.

In contrast to some popular speculations about a massive increase in sexual behavior labeled "permissiveness without commitment," this survey of 2453 undergraduate students from four geographical areas in the United States provides data which suggest a behavioral pattern of "permissiveness with commitment." This pattern of "coitus with commitment" was evident not only for females, but for males as well. With minor exceptions, the pattern was detected for both sexes in all four geographical regions. Speculation is made about ways in which this pattern may be one outcome of the alleged intersex convergence in sexual attitudes and behavior among American college youth. Implications are drawn for the increment of theory.

Attitude↗