Adolescents who engage in early sexual activity face risks of STIs, pregnancy, and emotional pain. Two common types of sex education in the US are abstinence-only and comprehensive sex education, but few studies have examined the influence of peer groups and families on adolescent sexual decision-making. This document reviews literature showing that adolescents who engage in risky sexual behavior often minimize risks, have risk factors like lack of supervision, or believe relationships are "safe". Comprehensive sex education may marginally reduce sexual activity and pregnancy rates compared to abstinence-only or no sex education, though abstinence-only programs claim to delay sexual initiation despite little evidence of effectiveness.