logic:

the don't have sex for these 10 reasons list uses a mind-boggling logic.

2. To feel good

Sex feels incredibly good�but so does wolfing down a whole large pizza. Indulge in any food outside healthy limits (like reasonable portion sizes!), and it's going to cause problems such as weight gain. In the same way, if abused, sex can cause lifelong heartache as well as physical consequences, such as sexually-transmitted diseases.

so to a teen this says...

don't have sex for longer than it takes to eat a couple slices of pepperoni pizza and you won't get VDs