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At least 19 recordsLinked to original sources
PubMed1979

Coitus and associated amniotic-fluid infections.

Data were analyzed from 26,886 pregnancies to determine whether coitus is involved in the genesis of amniotic-fluid infections. The frequency of infection was 156 per thousand births when mothers reported coitus once or more per week during the month before delivery, versus 117 per thousand when no coitus was reported (P less than 0.001). The percentage of infected infants who died was 11.0 when there was coitus versus 2.4 when there was no coitus (P less than 0.001). The frequencies of low Apgar scores, neonatal respiratory distress, and hyperbilirubinemia were about doubled when mothers reported coitus. The coitus-associated effects were greater in preterm than in fullterm infants. The pregnancies in the study took place between 1959 and 1966, when national perinatal mortality rates were higher than they are now. Deaths from coitus-associated infections may be less frequent today.

Black or African American↗
PubMed1977

Dysplasias of uterine cervix: epidemiological aspects: role of age at first coitus and use of oral contraceptives.

Age at first coitus and use of oral contraceptives were studied in a highly homogeneous population (French Canadian) during a cytologic cervical cancer screening program. Both factors were known in 84,540 women without cervical lesions and in 2017 patients with mild and moderate dysplasia. Highly significant correlations were found between: early onset of sexual activity and occurrence of dysplasia; oral contraceptive use and occurrence of dysplasia; early age at first coitus and oral contraceptive use. When correlated for age at first coitus, there was a significant excess of dysplasias in oral contraceptive users. Dysplasia of the uterine cervix behaves epidemiologically like carcinoma in situ and invasive squamous carcinoma, that is, essentially as a venereal disease. It remains to be seen whether all dysplasias form one continuum or whether there are two morphologically similar but biologically distinct forms of dysplasia: one more frequent, regressing spontaneously, the other relatively rare, progressing to carcinoma in situ and invasive squamous carcinoma of the cervix.

Adolescent↗
PubMed1976

Prematurity and orgasmic coitus during pregnancy: data on a small sample.

Nineteen mothers of premature infants were interviewed in an attempt to determine a possible relationship between prematurity and orgasmic coitus during pregnancy. Although the limited number of subjects precludes tests of statistical significance and definite conclusions, the findings do suggest possible associations. While there appeared to be no relationship between prematurity and coitus per se during pregnancy, the association of frequent or intense orgasm with prematurity does raise some questions that further investigation might answer. Because of the hazard of prematurity to the subsequent development of the child, further exploration of the possible relationship of prematurity to orgasmic coitus during pregnancy appears warranted.

Coitus↗
PubMed1977

A study of the relationship between coitus and the luteinizing hormone surge.

Twenty-seven wives participating in a study of sexual activity patterns had identifiable shifts in basal body temperature and midcycle surges of serum luteinizing hormone (LH). When sexual activity data were examined using the LH surge as a centering point, it was observed that the day before the LH surge had only an average probability of coitus and organism. These findings suggest that neither coitus nor orgasm often triggers ovulation in humans. This cannot be taken as evidence that coitus-induced ovulation never occurs.

Adult↗
PubMed1975

Effect of coitus on serum levels of testosterone and LH in male and female rabbits.

Levels of testosterone (T) and LH in the peripheral serum of male and female rabbits were measured and compared following coitus. Blood was collected by heart puncture from restrained, unanesthetized animals of both sexes. In male rabbits, basal serum T levels were highly variable, ranging from 131 to 12,149 pg/ml, and if low preceding coitus they tended to rise; whereas, if high, they usually dropped as they did in nonmated males subjected to repeated heart punctures. In contrast, basal serum LH levels in males were quite constant (mean +/- SE, 1993 +/- 152 pg/ml) and were not significantly altered after coitus unless blood T levels had been drastically lowered by two priming doses of estradiol benzoate. In intact does, on the other hand, copulation which resulted in ovulation induced an approximately 20-fold increase in serum LH concentration which was sustained for about 4 hr. Postcoital elevations in serum LH also occurred in estrogen-primed intact and estrogen-primed ovariectomized does. Under the conditions of our experiments, the parallel elevations in serum LH and T observed postcoitally in the female rabbit could not be demonstrated in the male.

Animals↗
PubMed1977

Quantitation of vaginal acid phosphatase and its relationship to time of coitus.

In cases of alleged sexual assault a quantitative vaginal acid phosphatase determination may indicate not only the presence of seminal fluid but also the approximate time of coitus, even in the absence of spermatozoa. A method of obtaining and handling vaginal swabs allowing for acid phosphatase determination and examination for spermatozoa was developed. Postcoital samples were obtained from 26 women and analyzed for ACP activity. Quantitative levels of ACP were related to time since coitus. These levels were compared with those found in 104 cases of alleged sexual assault and in 27 women volunteers.

Acid Phosphatase↗
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↗
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↗
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↗
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↗
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↗
PubMed1978

Age differences in attitude change toward premarital coitus.

Research on changes in attitudes toward premarital sexual behavior examine either (1) changes in attitudes of college students over a relatively short period of time or (2) changes in attitudes of adult nonstudent populations over long periods of time using noncomparable data sources. The present research examines changes in attitudes toward premarital coitus over a relatively short period of time utilizing national probability samples of the U.S. population. Rather than treating age as a dichotomous variable of the young and the old, age is considered in 10-year age groups, and changes by age group and sex are examined. The results indicate obvious dangers in employing gross breakdowns of the age variable in that considerable differences within young and old age groups are observed. Further, these difference interact with sex, producing sex- and age-specific change patterns. The exact nature of these patterns strongly suggests that the most rapid change is taking place among females in the 30--39 age group and that this change is such to produce intersex convergence in this age group. Rates of change by age and sex are discussed in terms of the possible differential influences of changes in women's roles.

Adolescent↗
PubMedDate not supplied

Sexual inhibitions men live by: self-perceived attitudes toward coitus of retired aged males.

There is a dearth of empirical studies on the sexuality of the aging male and female. The present study was conducted to determine the affects of self-perceived negative attitudes toward sexual intercourse by aged males as inhibitory mechanisms of coital behavior. Results indicated the extent to which negative attitudes toward coitus do influence the sexual inactiveness or sexual activeness of aged males. They educed the self-perceived attitudes of sexually inactive and sexually active males regarding frequency of occurrence, rank-ordering, and similarities and differences for each group. Further, physiological and psychological implications of coital behavior and its relationship to love between aged mates are considered.

Aged↗
PubMed1978

Vaginal evisceration after forcible coitus with intraabdominal ejaculation.

An unusual case is presented of vaginal evisceration after forcible coitus in a healthy young woman with no anatomic defects or history of previous pelvic surgery. Intraabdominal ejaculation, documented cytologically, provided evidence of penile penetration of the pouch of Douglas. Etiologic mechanisms and management are discussed.

Abdomen↗
PubMed1978

Patient's sources of information on coitus during pregnancy.

Obstetric patients were asked what sources they consulted for information about the advisability of coitus during pregnancy and what period of abstinence they inferred was proper from each. In general, the patients in the sample had incomplete information about these matters. A good indicator is that only 1 of the 17 patients in the sample had discussed them with her physician, and she did not know his recommendations.

Adolescent↗
PubMed1975

Current research in coitus-induced ovulation: a review.

Against the background of renewed interest in the existence of reflex ovulation in many animal species and the possibility of its existence in man, this review on current research efforts embraces the multitude of nervous influences and stimuli accompanying cohabitation. Species showing reflex ovulation are not restricted to those using this as the sole ovulatory mechanism, but include also so-called facultative ovulators, which seem to use this mechanism as a last resort to assure reproductive capacity under adverse situations (rat); and species which for the length of the standing heat period become temporarily induced ovulators for the optimal coordination of all necessary steps to assure fertility (cattle, pig, sheep); and species in which frequent cohabitation (rat) or a single coitus after artificial insemination (sheep) assures either optimal ovulation or conception rates. Copulation might not always be essential; some of the cohabitation-related reflexes might be transmitted by olfactory, ocular, tactile and acoustic stimuli; emotions may play a role. These stimuli are transmitted to the CNS from the periphery by afferent nervous pathways, and are translated in the thalamic-hypothalamic-pituitary complex into neurohormonal phenomena, causing ovulation; or may cause, mainly by LH and/or oxytocin discharge, an acceleration or augmentation of processes involved in spontaneous ovulation. Intensive biochemical and pharmacological studies have unveiled some of the neurohormonal mechanisms involved in the hypothalamus and how these stimuli are transmitted to the pituitary or received at the ovarian level, as hormonal or neurohormonal phenomena.

Amenorrhea↗