Is '16 And Pregnant' An Effective Form Of Birth Control?

"The U.S. teen birthrate — one of the highest in the developed world — has been dropping in recent years. There are a number of reasons for the decrease, and a attributes a portion of the decline to an unlikely cause: MTV's , a show that takes a brutally honest look at what life is like for pregnant teens..."

 http://www.npr.org/2014/01/13/262175399/is-16-and-pregnant-an-effective-form-of-birth-control