Morbid curiosity at its finest, like a car crash on the side of the road you just can’t take your eyes off. It’s hard to say if it’s bad for you because little study has been done on the concept. You’d probably need a psychologist to study you so there can be a clearer picture, I’m sure they could see whether you looking at Troon snatch all day on the internet is a sign of being headfucked or not.
If I was to swing my dick around and take a wild guess, I’d say we do it because it’s a partially primal/subconscious instinct to try learn of danger without learning the hard way. Same thing with the car crash example. You don’t wanna be that guy in the crash, and you don’t wanna be the guy that self mutilates his cock and balls.