I'm not surprised. To some, domestic disputes are an aphrodisiac. My guess is that the adrenaline rush caused by activating the fight-or-flight response causes effects including horniness. I should get a grant to study this!

Chris Pratt was having a scene with a co-actor and in the scene, she had to slap his face. His expression shifted to WTF? and said do that again.. She redid the scene and he had to stop everything. it gave him a woody. Fort some people, that short sharp pain causes that reaction and it sounds like that is a kink your dad has and your mom uses. Sorry dude.. hope you are getting to the point you can move out soon. =)

Well, make-up sex can be very good sex. Or maybe that's their foreplay. Or a kink.