THE SECRET LIFE OF TEENS, ON "PRIMETIME," THURSDAY, MAY 18

"Primetime" Hosts a Teenage Slumber Party to Talk About Sex

Is MySpace.com Safe?

When a First Love Becomes a Life-Threatening Situation

What is life really like for today's teenagers? More specifically, what are they saying - and doing - about their sex lives? In collaboration with Seventeen Magazine, "Primetime" holds a sleepover in which 14 girls from around the country volunteer to spend a night together talking to Cynthia McFadden about intimate details of their lives - including their first sexual experiences. The open conversation among the young strangers reveals just how harsh and fast the world of teen sex is today. According to an ABC News poll, 70% of teens say their first time was unplanned. And while only four of the girls say they've had sex, it's what many don't consider sex that's so fascinating. McFadden talks to the girls about everything from kissing and oral sex to parties where sex takes center stage. The following day, some parents are in for a rude awakening when they see the video of what their daughters have so openly discussed with strangers, yet never broached with them. "Primetime" airs on THURSDAY, MAY 18 (10:00-11:00 p.m., ET) on the ABC Television Network.

Then: Chris Cuomo examines the phenomenon of MySpace.com, and how kids chatting to strangers on the Internet can have serious consequences. The site is one of the hottest online sites where kids go to hang out these days. People make their own web page with the goal of connecting to others with similar interests. My Space can be a wholesome place to share pictures and stories, but is it also one-stop shopping for sex and drugs?

And: A story of how a first love turns into psychotic love -- when a boyfriend goes over the edge. Jim Avila looks at how relationships among teens can become as life-threatening as any adult abusive relationship. Avila sits down with a young woman who was stabbed in the back with an eight-inch knife by a young man who couldn't bear the fact that she was breaking up with him. But she lives to tell the tale, and wants to warn others that young love isn't always as innocent as it seems.

DIANE SAWYER, CHRIS CUOMO, CYNTHIA McFADDEN and JOHN QUIQONES are the anchors of "Primetime." DAVID SLOAN is the executive producer.