It's quite common among gay doms and subs. Spitting always challenges me. It's so visceral, I always worry that I'm crossing a line with it. But I do it.
I am not a fan tbh, if someone spat on/at me I'd probably take a swing at them out of pure instinct! It is crossing a line for me, I would find it degrading.
No, I don't like to splitting because I can say that it's some time very weired to split anywhere or to any body and I seen lots of sex videos where girls are enjoying guys cums and guys splinting into them.