BACKGROUND We address the ecological and evolutionary dynamics of human papillomavirus (HPV) that lead to the dichotomy between high-risk (HR) and low-risk (LR) types. We hypothesize that HPV faces an evolutionary tradeoff between persistence and per-contact transmission probability. High virion production enhances transmissibility but also provokes an immune response leading to clearance and l...

This study reports on genetic and environmental influences on the frequency of orgasm in women during sexual intercourse, during other sexual contact with a partner, and during masturbation. Participants were drawn from the Australian Twin Registry, and recruited from a large, partly longitudinal twin-family study. Three thousand and eighty women responded to the anonymous self-report questionn...

BACKGROUND Control programs for Reproductive Tract Infections (RTIs) typically focus on increasing awareness of risks associated with different forms of sexual contact, and pay little attention to how or why people may link RTIs to other features of their physical or social environments. This paper describes how women in a peri-urban pueblo joven located in the coastal desert surrounding Lima, ...

"This paper suggests that incest has been underestimated as a significant determinant of emotional disturbance, and that misuse of sexuality between parents and children can have detrimental consequences that parallel those resulting from other forms of child abuse. The spectrum of parent-child sexuality is classified into ten categories as a guide to the diagnosis, management, and prognosis of...

Results of an exploratory research project elaborating the contexts, patterns and specific scenarios of the commercial sexual activity of northeastern Thai men are reported. Data were collected using face-to-face surveys, focus groups, key informant interviews and observations in 32 northeastern villages (n = 744 men), 18 migrant labour camps housing sugarcane workers (n = 219 men), and five ca...

We examined police occurrence and criminal records data for a sample of 201 registered male child pornography offenders originally reported by Seto and Eke (Sex Abus J Res Treat 17:201-210, 2005), extending the average follow-up time for this sample to 5.9 years. In addition, we obtained the same data for another 340 offenders, increasing our full sample to 541 men, with a total average follow-...

BACKGROUND HIV spread continues at high rates from infected persons to their sexual partners. In 2009, an estimated 2.6 million new infections occurred globally. People living with HIV (PLHIV) receiving treatment are in contact with health workers and therefore exposed to prevention messages. By contrast, PLHIV not receiving ART often fall outside the ambit of prevention programs. There is litt...

background : main technique to control acquired immunodeficiency syndrome (hiv) infection is the effective preventive programs among high-risk groups. modeling is one of the effective methods where there is inadequate data. we used the modes of transmission (mot) model to predict the transmission of hiv infection in iran. methods : we systematically searched published and grey literature to fin...

BACKGROUND The incidence of sexual transmitted infections (STIs) and HIV/AIDS is globally higher in young people. This study evaluated the prevalence of sexual reproductive behaviors among undergraduate students of Mashhad, Iran. METHODS The study was conducted on 605 students in twelve non-medical faculties of a great university of Mashhad. A self-administered questionnaire was completed on ...

Introduction: The first case of HIV-infection in Iran was a hemophilic child who was infected by imported blood products in 1989. Since then, the HIV epidemic in Iran has undergone significant changes. This study investigated the time variations of the epidemiology of reported HIV/AIDS -infections during 2011-2017 in Yazd, Iran. Methods: This analytical cross-sectional study was carried out us...