Surprise! Half of US Pregnancies Are Accidents

Nearly half of all US pregnancies are accidents, a new survey shows. The risk of unintended pregnancy is especially high for women unsatisfied with their contraceptive method, says the report, released by a think tank on reproductive issues. The problem isn't laziness or absent-mindedness, reports the Boston Globe—it's a complex combination of attitudes, habits, and other factors.

"The way I explain it to my patients is, Mother Nature wants the species to survive, so all of us are hard-wired for sex," said one internist. "And that's what you're up against. It's not about 'good person' or 'bad person.'" (More pregnancy stories.)