Teen pregnancies in New York City have plummeted 27 percent in the past 10 years. Thomas Farley, commissioner of the NYC Department of Health & Mental Hygiene, explains why on the Brian Lehrer Show.

Temitayo Fagbenle, Radio Rookie, talks about her piece on what she calls "slut shaming" -- how teens use the Internet to bully each other and share sexually explicit material.

→ Live Chat at 1pm Today: Radio Rookies Shares Advice

Sociologist Amy Schalet was born in the United States, but she grew up in the Netherlands. When she returned to U.S. for college, she was surprised to learn that most of her American-reared peers had never discussed sex with their parents. Most of her Dutch friends had open, long-running discussions with their parents on the topic. This discovery shaped Professor Schalet's research through graduate school and beyond. She's published her findings in a new book, "Not Under My Roof: Parents, Teens and the Culture of Sex."  

According to a new study by the CDC's National Center for Health Statistics, the teen birthrate fell to an all-time low in 2009. Last year, there were 39.1 births per thousand girls between the ages of 15 and 19.  Early data from the first six months of 2010 show that the downward trend continues.