Aside from fighting I have only seen this from one person who happens to be a friend. He will often give a big slap on his wifes ass. And usually she just gives a yell but when he hurts her to much she will turn around and punch him
It can be fun to see reactions, one of my fuck buddies loves to do that when we are out. Out of the blue he'll give me a full force slap on the ass in a public place and make me yelp, usually on some fresh bruises or welts; I return the favor by grabbing his balls and squeezing
my first girlfriend, way back in the puppy love days used to grab my balls and thats why i told her i didnt want to be her boyfriend anymore. she is a lesbian now which somewhere there is a job for her psychiatrist. oh yeah and she has a son. i have wondered how that came about but never had the nerve to ask her. my best guess was that she used pregnancy to get out of the navy. the main reason i dont want to ask is because if it was a rape i dont want to bring up those bad memories to the surface.