Yes. Every. Stinking. Day. Biting, licking, slapping me, "tapping" my head, you name it, I probably experience it on a regular basis. To cope, I hide the body parts (i.e. bottom) from them when their around, with is almost always. It's honestly kind of a game now. But it's not funny, and a lot of the time I don't laugh. To keep them from doing this I push them away gently, command them to get off, occasionally retaliate, etc.