The New York City Health Department has been surveying the sex lives of people who have multiple partners! (PDF here.) In case you were wondering, "multiple partners" means you've had sex with two or more people in the last year. (Ha ha ha!) One-third of men aged 18 to 24 had multiple partners. Isn't that shocking? Yes: two-thirds of straight college-age men say they only have had one sexual partner in the last 12 months. Um, lies! Also? Two out of five women weren't using contraception at all—but more than four out of five women said they weren't planning on getting pregnant. That is because everyone loves Plan B. Gay dudes were three times as likely as straight people to have multiple partners! Isn't science wonderful? Wasn't this useful?