I've found that advertising rarely even pays for your server bills when you're getting started. More often it just annoys your users and gets in the way of doing something more productive with your time.
AdBrite is private, though, so we don't know what percentage of adult ads account for revenues, but they do have an entire other site -- BlackLabelAds.com - dedicated to adult ads.
Anyway, it was just an obvious suggestion, given the 3boobs site you'd already created.
Porn-ish sites like that do attract advertisers.