Sexuality is an essential aspect of quality of life. Nevertheless, sexual intercourse is physically challenging and leads to distinct changes in blood pressure, heart, and respiratory rate that may lead to vital complications. We present a case report of a 22-year-old female suffering from subarachnoid hemorrhage after sexual intercourse. The patient was immediately transported to hospital by e...

PURPOSE Using a genetically informed, discordant twin analysis, the objective of this study was to examine whether earlier onset of drinking and smoking behaviors predicted early sexual intercourse onset. METHODS Over 3,400 adult same-sex twins from the Australian Twin Registry completed a structured interview that included retrospective reports on onsets of smoking, drinking, intoxication, a...

BACKGROUND Intercourse in mammals is often coordinated with ovulation, for example through fluctuations in libido or by the acceleration of ovulation with intercourse. Such coordination has not been established in humans. We explored this possibility by examining patterns of sexual intercourse in relation to ovulation. METHODS Sixty-eight sexually active North Carolina women with either an in...

OBJECTIVES To document prevalence rates for selected aspects of sexual behaviour among Cape Town high-school students and to conduct a survival analysis of age at first intercourse. DESIGN Cross-sectional survey. SETTING State high schools in Cape Town. SUBJECTS A multistage cluster sample of 2,740 grade 8 and 11 students at 39 schools. OUTCOME MEASURES Ever having had sexual intercours...

In this issue of the journal, Jin et al. [1] report a detailed analysis of the association between sexual risk-reduction behaviours other than condom use and incident HIV infection in a cohort of HIV-seronegative men who have sex with men (MSM) in Sydney, Australia. Sexual riskreduction behaviours that are studied here include ‘serosorting’, unprotected anal intercourse with HIVseronegative par...

OBJECTIVE This report presents data on the prevalence of oral sex with opposite-sex partners and the timing of first oral sex relative to first vaginal intercourse among females and males aged 15-24 based on the National Survey of Family Growth (NSFG) data from 2007-2010. The question on timing, added to the NSFG in 2007, asked females and males whether first oral sex occurred before, after, or...

Objective. To determine if sexual intercourse reduces absorption of vaginal progesterone gel in women and to determine if progesterone is absorbed by the male during intercourse. Study Design. Prospective, randomized, cross over, controlled study of 20 reproductive-aged women and their male sexual partners randomized to receive vaginal progesterone gel (Crinone 8% gel, Actavis Inc., USA) or pla...

The authors examined the relation between age at first vaginal intercourse and a positive nucleic acid amplification test for sexually transmitted infection (STI). A nationally representative sample of 9,844 respondents aged 18-26 years was tested for chlamydial infection, gonorrhea, and trichomoniasis in wave 3 (2001-2002) of the National Longitudinal Study of Adolescent Health. The authors us...

OBJECTIVE Previous studies have demonstrated that early age of first sexual intercourse is associated with human papillomavirus (HPV) infection. The objective of this study was to identify a set of risk behaviors and partner characteristics that mediate the association between age of first sexual intercourse and subsequent HPV infection in adolescent and young adult women. METHODS Female univ...

OBJECTIVES This analysis estimates the percentage of adolescents who have had sexual intercourse by age 14 or 15 and examines characteristics at age 12 or 13 that are associated with early sexual activity. DATA SOURCE The data are from the 1996/97, 1998/99 and 2000/01 National Longitudinal Survey of Children and Youth, conducted by Statistics Canada. ANALYTICAL TECHNIQUES Descriptive statis...