A Latent Class Analysis of Sexual Behavior and Associations with Sex Education, Smoking, Drinking, and Pornography Use Among Chinese Youth.

The incidence of sexually transmitted diseases has alarmingly increased among Chinese youth in the past decade, and newly diagnosed cases of AIDS have almost doubled between 2010 and 2015. However, little is known about classes of sexual behavior among Chinese youth and associations with their other health behavior or experience of sex education. This study aimed to first identify classes of sexual behavior using latent class analysis and then to examine their associations with sex education, smoking, alcohol drinking, and pornography use. Data were from 13,865 unmarried youth aged 18-24 from the 2009 National Youth Reproductive Health Survey. Six indicators were used: timing of the first sexual intercourse, the number of past-year sexual partners, sex outside of a relationship, incidence of pregnancy, and contraceptive use at the latest and the first sexual intercourse. Four classes were identified: no sex (Class 1, 69%), safer sex (Class 2, 13%), early risk (Class 3, 13%), and multiple risk (Class 4, 5%). Smoking, drinking, and regular pornography use were associated with increased odds of being in the multiple risk class relative to the safer sex class. Sex education, smoking, and pornography use were associated with decreased odds of being in the no sex class relative to the safer sex class. The findings revealed qualitatively different classes of sexual behavior among Chinese youth and important roles of sex education, substance use, and pornography use. Reproductive health service providers can offer individually tailored services to serve youth with different profiles and needs.