Turns out, guys are far more likely to be amused by jokes that single out one person for his behavior. That explains why a buddy's farting- and the merciless teasing that inevitably follows the expulsion- is about the funniest thing they've ever witnessed. Plus laughter- usually at someone's else's expense- is crucial to male bonding, which could be why they attempt to trigger it with crass jokes.

Infact, research shows that men laugh more with other males than they do with females...

and that's probably because their buddies share their penchant for a certain type of punch line.