It puts me in mind of a study just published in the August issue of Pediatrics. The study looked at the sexual habits of a group of teenagers. It surveyed them at baseline and then two or three years later. It found that the kids who listened to music with sexually degrading lyrics were the ones who increased their sexual activity the most. Please note, lyrics about sex and romance didn't increase the sexual activity; it had to be degrading lyrics, like lyrics that talked about women as whores - or ho's- and other misogynist things.
Perhaps you saw this reported in the lay press. It was widely reported that sexually degrading lyrics caused kids to increase their sexual activity, but that is not what the study showed. It said that listening to such lyrics was associated with increased sexual activity, and association is a horse of a different color than causation, although that distinction is often too subtle for the lay press. It's very possible that the degrading lyrics didn't cause the increased activity. Maybe it's just that kids who were going to have increased earlier sex activity anyway were the same ones who happened to like such music.
Mind you, I suspect that such music probably does at least partially encourage kids to have earlier sex. It's pretty well established that watching violence on TV makes kids more violent, and I think the same is true for sex on TV, although I don't keep up with that literature. But this study didn't prove it. Nevertheless, I'm glad my kids like the Barenaked Ladies, who in spite of their name sing pretty clean songs, instead of some "artist" who prefers to sing about women as rough sex objects.