OBJECTIVE To identify the human immunodeficiency virus (HIV)-related risk behaviors associated with HIV testing among US high school students who reported ever having sexual intercourse. DESIGN Secondary analysis of a cross-sectional study. SETTING The 2009 national Youth Risk Behavior Survey. PARTICIPANTS A total of 7591 US high school students who reported ever having sexual intercourse...

OBJECTIVE To determine the time between first intercourse and first sexually transmitted infection (STI) with Chlamydia trachomatis, Neisseria gonorrhoeae, or Trichomonas vaginalis and time between repeated infections. DESIGN Observational study. SETTING Three adolescent medicine clinics. PARTICIPANTS A cohort of 386 urban young women aged 14 to 17 years at enrollment. MAIN OUTCOME MEAS...

OBJECTIVE To analyze age and condom use at first sexual intercourse among Brazilian adolescents at two periods: 1998 and 2005. METHODS Representative samples of the Brazilian urban population were interviewed during a household survey for two studies, carried out in 1998 and 2005. Interviewees included 670 sexually active young people (aged 16 to 19) who were selected for the study, 312 in 19...

BACKGROUND The age of initiation of sexual intercourse is an increasingly important issue to study given that sexually active young women are at risk of multiple outcomes including early pregnancies, vesico-vaginal fistula, and sexually transmitted infections. Much research has focused on the demographic, familial, and social factors associated with sexual initiation and reasons adolescents beg...

OBJECTIVE The ENDURANCE study evaluated the efficacy of vardenafil, a phosphodiesterase type 5 (PDE5) inhibitor, in men with erectile dysfunction (ED), by measuring the duration of erection leading to successful intercourse using a stopwatch as the assessment instrument. METHODS This was a randomised, multicentre, double-blind, placebo-controlled, crossover study consisting of a 4-week treatm...

Using Steele's inhibitory conflict model (C. M. Steele & R. A. Josephs, 1990) as a framework, the present study investigated the link between alcohol use and the probability that intercourse occurred on 2 different 1st date occasions in a random sample of adolescents and young adults interviewed twice approximately 4 ~/2 years apart (Ns = 1,678 and 1,780, respectively). As expected, both betwee...

Girls who report first sexual intercourse during their early teen years have much higher rates of teenage pregnancy and childbearing than girls who delay sexual onset until older adolescence. In this study, we examine genetic and environmental influences on variation in teenage pregnancy and covariation with age at first sexual intercourse in two cohorts of Australian female twins. In the older...

Diabetes mellitus, when producing hyperglycemia, as well as angiopathic, vasculopathic, and neuropathic complications, poses a threat to the function and viability of sexual arousal and intercourse at similar and different levels in males and females. Males are faced with hypogonadism, depression and anxiety, affecting their sexual arousal desire. Male intercourse may be impaired by erectile dy...