I'm gonna have to say... oviposition/impregnation in general. When I first encountered the concept I was a little grossed out by oviposition stuff tbh, but it turns out to moreso be like. A certain flavor of it I Do Not Like [Do Not Show Me Them Hatching Inside]. In combination with other things [Cum Inflation] I get way more into it. As for general impregnation, I don't want kids tbh, so I figured it was a no-go. But there's something about the like. Manic energy certain artists put into it of how badly one party wants to impregnate/be impregnated that is just like. Rabid little animal noises.