Sexual behavior and condom usage by marital status.

Unsafe casual or commercial sex was defined as a participant with sexual experience having had casual or commercial sexual intercourse during the previous 12 months without using a condom every time.本研究将非安全性临时或交易性行为定义为：存在性经历的研究参与者在过去12个月内发生临时或交易性行为时，未做到每次均使用安全套。