It's not about how psychology works, it's the unknown pull to go in. AFAIK our physiology doesn't turn us into weird gangly monsters if you put pressure on our neck and limbs, but you don't seem to have a problem suspending your disbelief in that way, at least not in any way you mentioned. I think the urge to enter the holes is framed as almost supernaturally strong. Maybe it was written with a basis in the idea of intrusive thoughts, but its more like a cognitohazard that enters your mind when you see "your" hole that compels people to climb inside. I find the horror comes more from the idea that you might find a hole that you become convinced is yours and would travel all the way there just to enter. (And then the claustrophobic darkness too)

Who is so intently staring at their own junk so much they feel the need to pretty their nails up while they be wankin it

How dare you call me out like this

I Dew hate it when that happens.

It do be like that