In a study of US young women, a significant portion of straight-identified youth reported engaging in some type of same-sex activity . Sexual minority youths (who identify themselves as gay or lesbian, bisexual, or unsure of their sexual identity) may be less likely to use condoms or other birth control methods . Sexual minority female adolescents have a significantly higher odds ratio of having an STI than female adolescents who are attracted only to males .
More than 1 in 4 female adolescents aged 15-17 in Canada reported having sexual intercourse in the previous year (CCHS) and the proportion of sexually active teens varied across the country in 2005, with over 40% of surveyed teens in 2005 from the territories reporting having intercourse within the past 12 months . The potential risks for 15 years olds are mainly linked to the emotional characteristics of this developmental stage . A number of American studies confirm that drinking alcohol precedes unplanned sexual intercourse among young women [17, 18, 19]. Alcohol use may be more likely to be a factor in new, compared with repeat, sexual behaviours .
Most women report having one sexual partner in the previous 12 months in the 2009/10 CCHS, which did not differ by income, geographic location or education level . In one study, roughly 19% of adult women reported “cheating” on their current dating partner . Women who are intravenous drug users may have multiple partners in they are trading sex for survival, including for housing and drugs. One reason women give for their involvement in sex work is the lack of other employment and education opportunities.