Vulgar slut with a pimply ass and an impossibly fucked up front. Personally, I like to fuck sluts, too, and I fuck them with a condom. But kissing her labia? The man is clearly wrong! He'd rather put his dick in her anus! I don't mind mutual oral caresses, but you have to be more careful when choosing ladies. And vulgar, slutty ladies are only good enough to give them in the mouth and to fuck them well, always with a condom!
I think the guy is far from a pioneer, the girlfriend is very confident in the anus! It feels like a lot of experience and regular practice. He's probably happy that he got into a well-developed anus, and he doesn't have to talk his girlfriend into it!