Fraternity and sorority membership and risky sexual behavior.

To determine the impact of fraternity and sorority membership on condom use during sex. Utilizing data from The American College Health Association (ACHA) National College Health Assessment from 2016-2018, we estimated a linear probability, logistic, and instrumental variable model to determine the relationship between fraternity and sorority membership and the frequency of condom use during sex. Compared to non-fraternity members, fraternity members experience an increase in sex without a condom for both oral sex (13.5%, 95% ci= 0.048, 0.221) and anal sex (28.5%, 95% ci= 0.174, 0.396). Compared to non-sorority members, sorority members are more likely to engage in oral sex without a condom. This result is not robust to single sorority members. Fraternity membership increases the probability of risky oral and anal sex. The reduced use of condoms has implications on sexual health including an increased risk of contracting or spreading sexually transmitted infections.