you say you wonder why he "went inside"? http://en.wikipedia.org/wiki/Cremaster_muscle <check it out this is what happened...his cremaster took over. in the link i provide they state why the cremaster acticvates. some call it the soldier reflex...so man can run better or protect his junk in a fight. 5-6 erect is average....were you excited by seeing the big dong? did it make you more curious than your average endowed boyfriend? i think that is where his head is at if he sucked in.