MyEx.com is a site that allows people to upload content on the Internet of ex-partners that they think need to be exposed to the entire world. While it functions mainly for dudes to show off their girlfriend's nudes, you will find that there is a 'just guys' section that reveals the sexual antics of ex-boyfriends. Not all of it is gay content, but if you're looking for real people doing silly things for their ex partners, this is where you'll want to look.
The site is mainly based in the US, and I will just point out that this may not be the best place to get porn. I don't even know how I feel about people sharing this content on the Internet without permission, but I guess I should blame the guys more for being dumb enough to shack up with people that are likely to do this type of thing.
Anyway, Check out MyEx.com today if you're down for some shaming of previous partners. This place can be pretty rough though - don't say I didn't warn you.