I thought of this when I read Richard's link to the parody drug commercial: ever seen the ads for that birth control patch? They say it causes "blood clots, hemorrhaging, weight gain, stroke, etc." and they make no attempt to minimize it with a statement like "these effects were similar to other patients who received placebos," probably because nobody would want placebo birth control. ("I was in the placebo group? I'm not even married! I was just doing this for the two hundred bucks!")
Also, normal birth control pills contribute to osteoporosis and an increased risk of cancer. Ah, contraception: you gave us casual sex, rampant bastardy, and you strike at the very heart of marriage and family life. Is there anything you can't do?