In any case:
More girls in the U.S. are remaining virgins until their late teens and into their 20s, with the biggest rates of decline in sexual activity seen among African-Americans and Hispanics, the CDC says.
More than half of girls between the ages of 15 and 19 — 57% — reported that they had never had vaginal intercourse in the latest CDC survey covering 2006-2010, up from 49% in 1995.
Teen pregnancy rates have dropped more than 40% since their peak in 1990, and they remain at a 30-year low.
Even with the decline in teen pregnancies, the birth rate among teens in the U.S. is still among the highest of any industrialized nation.
Hmm, I wonder if that has anything to do with this sort of thing.