body hair appearing on male sims during sex

[brownboi96]

Weird as the title is, it keeps happening consistently, and its only on the dude. Every time he has sex, body hair would sprout out of nowhere, and when he has sex again after that, more layers of body hair is applied. Even weirder is that it can only be seen in game and not in cas. I recognize it as the modded body hair id downloaded but i can't even find the body hair in cas. I tried deleting all the body hair mods but then it gave my sim a default bush during sex, which isn't so bad but im just wondering why it keeps happening.