E. Research

Study says early sex does not make for bad kids - Rick Weiss, The Washington Post & Chicage Tribune, November 12, 2007

Researchers at Ohio State University garnered little attention in February when they found that youngsters who lose their virginity earlier than their peers are more likely to become juvenile delinquents. So obvious and well established was that cause-and-effect connection that it was already part of the required curriculum for federal "abstinence only" programs. 
There was just one problem: It is probably not true. 
Other things being equal, a more probing study has found, youngsters who have consensual sex in their early-teen or even pre-teen years are if anything less likely to engage in delinquent behavior later on. [...]
"It turns out that there was no positive relationship between age of first sex and delinquency," Harden said.

Research shows positive side to teen sexuality - National Sexuality Resource Center, San Francisco State University, October 25, 2005

New research shows positive side to adolescent sexuality and challenges dominant views of teen sexuality as problematic.

Researchers find sexual experience during adolescence may be associated with positive perceptions of one's self as a sexual
being and better sexual health and discuss implications of these findings for policies on sexuality education.