Who has sex with whom? Characteristics of heterosexual partnerships reported in a national probability survey and implications for STI risk

• DOI: 10.1093/ije/dyn216
• Publication Date: 2008-11-12T02:10:27Z
• Authors: C. H Mercer; A. J Copas; P. Sonnenberg; A. M Johnson; S. McManus; B. Erens; J. A Cassell
• Keywords: Heterosexuality

Background Sexually transmitted infection (STI) risk is determined both by partner numbers and partnership characteristics. Studies describing only recent partnership(s) overestimate long-term partnerships underestimate the contribution of casual to STI transmission in populations. We describe all heterosexual past year terms type, age geographical mixing how these characteristics relate condom use. Methods Probability sample survey 11 161 men women aged 16–44 resident Britain, 1999–2001. Computer-assisted self-interviews asked respondents about detailed questions their three most partnerships. weight data represent for which were not present estimates population Results Of 15 488 heterosexuals partnerships, 39.1% (95% CI 36.6–41.7%) men's 'not (yet) regular' vs 20.0% 18.2–21.9%) women's While condoms used at last sex 37.1% 35.0–39.3%) 28.8% 27.1–30.6%) 55.3% 52.6–58.0%) first with new partners, proportions declined age. When involved an difference 5+ years [26.2% 23.0–29.6%) 36.5% 33.0–40.1%) partnerships], less commonly than when partners closer [44.1% 39.1–48.4%) 60.8% 57.3–64.2%)]. Sex occurred within 24 h 23.4% 19.7–27.5%) 10.7% 8.3–13.6%) Conclusions A substantial minority casual. The proportion protected high, especially involving larger differences people 30s 40s. Condom use needs be promoted among age-groups.