This article discusses recent survey’s of parents regarding beliefs and practices of talking to their teens about sex:
http://kids.baristanet.com/2011/01/lets-talk-about-sex/
and this study looks at where teens get their information:
http://www.docstoc.com/docs/69332117/Where-Do-Teens-Go-to-Get-the-411-on-Sexual-Health–A-Teen-Intern
And this article discusses the importance of talking to your teens about sex:
http://www.canada.com/Parents+must+talk+with+kids/4271691/story.html
