...at least, that's the situation for people who take abstinence pledges and the like. Apparently, they have sex too! From the Daily Illini:

WASHINGTON - Students who participated in sexual abstinence programs were just as likely to have sex a few years later as those who did not, according to a long-awaited study mandated by Congress.

Also, those who attended one of the four abstinence classes reviewed reported having similar numbers of sexual partners as those who did not attend the classes, and they first had sex at about the same age as their control group counterparts _ 14 years and nine months, according to Mathematica Policy Research Inc. ...