There's a perk called cum drinker, says heals a bit of HP when swallowing cum.
I've been trying to tests it again and again but I haven't noticed any changes, I don't think its healing any HP, even a sliver. Either I totally just am oblivious somehow to the changes in and out of combat or it doesn't work at all. As far as I've been playing, it has not even given me 1 HP no matter how much I try to make the character drink.