Felching
A hardcore gay sex act between homosexual males during which the top sucks out the semen he deposited into his partner's anus.  Contrary to homophobic belief, the top generally refrains from performing such an act unless the bottom was well douched, the anus appears clean, and no lubricant (or edible lubricant) was used.  Also note that felching is not a popular homosexual act as most gay men do not enjoy the taste of their own semen.  
When Joey walked into the gym locker room, he couldn't help but get an erection after stumbling upon a beefy football jock felching out a hairy daddybear's tight butt.