- Coley, Medeiros, and Schindler (2008) explicitly examined the consequences of risky human sexual behavior and young adulthood. The authors found a highly significant relationship between risky sexual behavior during mid adolescence (from ages 14 to 16) and risky sexual behavior during late adolescence (from ages 15 to 19), suggesting that there is
some stability in risky sexual behavior over time. Specifically, they found that controlling for early drug use, that having unprotected sex during adolescence (when respondents were
on average 14 years old) predicted drug use during late adolescence/young adulthood
(when respondents were on average 19 years old).
- Coker, Richter, Valois, McKeown, Garrison, and Vincent (2004) found evidence that early sexual behavior was associated with a greater lifetime number of sexual partners, a lower likelihood of using a condom during their last sexual encounter, a higher likelihood of becoming pregnant or impregnating a partner as a teenager, and, for girls, a higher incidence of STDs. The authors concluded that the link between early and risky sexual behavior is logical. Youth who engage in early sexual behavior are less experienced and less mature than youth who wait until later adolescence to initiate sexual behavior, thus they are less aware of the physical and emotional risks associated with sexual intercourse. In turn, if they are unaware of the potential consequences of engaging in sexual intercourse, they will be less likely to protect themselves from STDs by using condoms or to see the danger in having multiple partners or having sexual intercourse while using substances like alcohol or marijuana (Coker, et al., 2004).