If you?re topping a guy or actually do a woman in the ass have you ever watched for the wink reflex of the bunghole? Most of the guys I?ve topped have been a little nervous at first so along with other things I?ve watched for it and started my cock in after seeing it, it?s like the butt slightly opens then shuts back, I think it goes in easier after the reflex happens. I also think some doctors do it before inserting their fingers.