What really ruins porn for me is when you get an office scene where the manager bangs one of the office juniors. They never show the manager going through college, getting his degree, applying for an entry-level job, going to the interview and spending the next few years working his way up the ladder until he's able to extort sex from the junior with the promise of a raise.
In all seriousness though, ass-to-mouth is a thing. It's in a lot of porn now, including Staxus, Eric Videos, TIM, Threshold Media... No, not edited, but single shots of a cock slipping out of an ass and into a mouth. It can be really hot to see in a video, but I'm not sure if I'd do it.
Having said that, haven't you ever been to an orgy? Or even a gay sauna? That random stranger's cock you just noshed could have been anywhere 2 minutes earlier. That's why at the very least you always perform a sniff test. LOL
