We won’t have sex. No, really, we promise.

At the risk of sounding too political, the U.S. government’s new ads promoting abstinence from sex probably won’t work. Part of the problem is that the Web site, 4parents.gov, is built around “scientific” evidence about the benefits of abstinence that is largely anecdotal or just made up. But the main issue is (and always will be) that trying to convince teenagers not to be horny is a colossal waste of money, and no amount of photogenic child actors telling America’s parents otherwise will change that.