Age-Based Mixing and Condom Use Patterns in Opposite-Sex Adult Partnerships in Hong Kong.

Our findings provide novel insights potentially useful for forming sexual health and STI control policy. First, the disassortative nature of casual and commercial partnerships in both men and women suggests they may be a mechanism for the seeding of younger generations and therefore a target of health interventions. Second, health communications may wish to target older men in particular given their higher tendency to condomless sex with casual and commercial female partners in the youngest-and therefore most susceptible-age groups. a lack the gender symmetry that was observed in regular partnerships.