These articles discuss and explore the phenomenon of sexting:
http://parentingtalks.com/2010/11/04/texting-sexting-whats-on-your-teens-phone/
http://www.pointparkglobe.com/opinions/sexting-freedom-of-speech-or-child-pornography-1.1825510
This article outlines the legal risks of sexting:
http://www.businesswest.com/details.asp?id=2616
and this article offers advice to parents
http://www.pregnancy-advice.org/texting-sexting-whats-on-your-teens-phone