uncircumcision
My guess would be, it can be thrilling to fear something so devastating as a circumcision. Kind of like how some people love roller coasters, or horror movies. You know you won’t actually get hurt, but the excitement of feeling threatened is exhilarating.
I read somewhere that the brain centers for fear and arousal are very close to each other. Maybe there’s leakage between the two.
And it’s definitely true that women love the feeling of helplessness associated with sex. Not being helpless, but feeling it with a man they trust.
So maybe all that adds up in our common psyche.
If it’s not your thing, don’t look at it.