It just seems to be natural - oh, look, there's a hole. Oh, look there's a thing that might go in the hole. Yeaaaah!

LMAO!!!Umm yes I think that it does come natural to them.
He isnt as interested in inserting inanimate objects in the bum...he reserves that for himself, but that darn other hole....its seems to fascinate him!!Abother thing is it is a bit embarassing to me when he does it..especially since he is always right down there watching every nanosecond...so degradation may be a small part of it to!!
Ahh yes...what a topic!!