I’m surprised no one brought up riding crops or whips in this discussion. Most of the girls I know that like the extreme side of being rough, including breathplay and biting, all started out slowly just liking a little spank here and there. It’s hard to really know what we like if we’re asked the full extremes right away.
My last g/f said that if when we first met I had asked to do some of the things she loved to do then, she would have ran away lol. But experimenting little by little we found that she liked really rough sex as well as sweet/easy sex.
The reason she did was not because it stimulated the skin to make sex better, but simply because she liked being dominated and controlled in the bed. And when she would fight against me and try to get free and I would force her(this all being a game, but the struggle real, she wanted me to win yet at the same time to have to fight me) and that “being forced” and feeling of being dominated really got her off.
The origin for that? Probably psychological no doubt. But anything we would try, as long as it was me dominating her, she loved it.