Shit happens.
Me and my buddy got super drunk and he told me that he had sex with this girl he met. It was a one-night-stand type of deal. Long story short, he stuck his finger in her anus. When he pulled it out, there was shit on his finger. That's not it though. He claimed she licked it off his finger, all of it. Exact quote from his story: "I ran the hell out of the room so fast." He said he grabbed his keys, phone, wallet, and his underwear and went home. I was dying at this point in the story. She even called him back the next day. Loyalty.
Fucking drunk stories.
Tip: You should alway wear a condom when you have anal sex, especially if your significant other hasn't had a thorough enema.