Results 11 to 20 of about 49,659,107 (249)

Geographical variations and contextual effects on age of initiation of sexual intercourse among women in Nigeria: a multilevel and spatial analysis [PDF]

International Journal of Health Geographics, 2008
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 ...
Uthman Olalekan A
doaj   +2 more sources

The effects of age at menarche and first sexual intercourse on reproductive and behavioural outcomes: A Mendelian randomization study. [PDF]

PLoS ONE, 2020
There is substantial variation in the timing of significant reproductive life events such as menarche and first sexual intercourse. Life history theory explains this variation as an adaptive response to an individual's environment and it is important to ...
Rebecca B Lawn, Hannah M Sallis, Robyn E Wootton, Amy E Taylor, Perline Demange, Abigail Fraser, Ian S Penton-Voak, Marcus R Munafò   +7 more
doaj   +2 more sources

Condom use in greek young adults’ dating relationships: The role of sexual debut condom use and relationship characteristics

Ψυχολογία: το Περιοδικό της Ελληνικής Ψυχολογικής Εταιρείας, 2020
We examined whether individual and relationship characteristics predicted condom use in Greek young adults’ ongoing relationships. Participants were 277 university students with ongoing dating relationships who provided their demographics and ...
Πάνος Κορδούτης
doaj   +1 more source

A comparative assessment of the quality of age at first sex and age at first marriage reporting in three HIV cohort studies in sub-Saharan Africa [PDF]

, 2009
OBJECTIVES: To assess inconsistencies in reported age at first sex (AFS) and age at first marriage (AFM) in three African cohorts, and consider their implications for interpreting trends in sexual and marital debut.METHODS: Data were analysed from ...
Zaba, B, Wringe, A., Herbst, K., Todd, J., McGrath, N., Mushore, P., McGrath, N, Cremin, I, Herbst, K, Slaymaker, E, Cremin, I., Zaba, B., Wringe, A, Kasamba, I, Kasamba, I., Mushore, P, Slaymaker, E., Todd, J   +17 more
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Early first sexual intercourse: A critical examination of the relationships between age at first sexual intercourse and later sexual outcomes among Australian men and women

, 2015
Submission note: A thesis submitted in total fulfilment of the requirements for the degree of Doctor of Philosophy to the Australian Research Centre in Sex, Health and Society, School of Psychology and Public Health, College of Science, Health and ...
Wendy Heywood (14366763)
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Are Nepali students at risk of HIV? A cross‐sectional study of condom use at first sexual intercourse among college students in Kathmandu

Journal of the International AIDS Society, 2010
Background Condoms offer the best protection against unintended pregnancies and sexually transmitted infections. Little research has been conducted to determine the prevalence and investigate the influencing factors of condom use at first sexual ...
Ramesh Adhikari
doaj   +1 more source

Is "Sexual Competence" at First Heterosexual Intercourse Associated With Subsequent Sexual Health Status? [PDF]

, 2016
The timing of first sexual intercourse is often defined in terms of chronological age, with particular focus on "early" first sex. Arguments can be made for a more nuanced concept of readiness and appropriateness of timing of first intercourse.
Gibson, Lorna J, Mercer, Catherine H., Ploubidis, GB, Johnson, Anne M, Copas, AJ, Clarke, Lynda, Ploubidis, George B, Johnson, Anne M., Palmer, Melissa J, Wellings, K, Ploubidis, George B., Copas, Andrew J., Palmer, MJ, Palmer, Melissa J., Mercer, Catherine H, Wellings, Kaye, Mercer, CH, Copas, Andrew J, Gibson, Lorna J., Gibson, LJ, Clarke, L, Johnson, AM   +21 more
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Age at first sexual intercourse and teenage pregnancy in Australian female twins [PDF]

, 2007
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
Martin, N. G., Turkheimer, E., Madden, Pamela A.F., Turkheimer, Eric, Heath, A. C., Bucholz, Kathleen K, Bucholz, K. K., Emery, Robert, Waldron, Mary, Waldron, M., Madden, P. A., Emery, R., Heath, Andrew C, Martin, Nicholas G   +13 more
core   +1 more source

Romantic and sexual behavior in young adolescents : repeated surveys in a population-based cohort [PDF]

, 2009
Adverse outcomes of teenage sexual activity are common in the United Kingdom. We used a computer-assisted interview to ask young adolescents aged 11-12 years (N = 6856) and 12 -13 years (N = 6801) who were part of the Avon Longitudinal Study of Parents ...
Ness, Andrew, Waylen , Andrea E., McGovern, Phil, Wolke, Dieter, Waylen, A, Wolke, DFH, Lowen, Nicola, Low, N, Ness, A, Waylen, Andrea E., Low, Nicola   +10 more
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Association between female reproductive behavior and functional gastrointestinal disorders: a mediated Mendelian randomization study [PDF]

Yixue xinzhi zazhi
Objective To investigate the causal association between female reproductive behavior and functional gastrointestinal disorders (FGIDs) using Mendelian randomization (MR).Methods Based on genome-wide association study (GWAS) data, two-sample MR analysis ...
QIU Xiaohui, LYU Jing, YIN Hongtao, GONG Xia   +3 more
doaj   +1 more source