Hi guys, sorry if this question has been asked before. I tried to search but couldn't find anything near. I am 6' 1" guy. I can take max 6 inch penis into my ass. anything longer gives me massive stomach pain. this pain is not related with thickness. it happens anything longer than 6 inch. and i feel pain when my partner pumps it in. when he pulls it back pain goes. (doesn't need to take it our fully). it happens at all positions. any help?