Here are some numbers that will astound you, courtesy of Nicholas Kristof:

The upshot is that while teenagers in the U.S. have about as much sexual activity as teenagers in Canada or Europe, Americans girls are four times as likely as German girls to become pregnant, almost five times as likely as French girls to have a baby, and more than seven times as likely as Dutch girls to have an abortion. Young Americans are five times as likely to have H.I.V. as young Germans, and teenagers’ gonorrhea rate is 70 times higher in the U.S. than in the Netherlands or France.