Very TMI and embarrassing

This is something that I've dealt with and wondered about for years and I've never been able to ask about it. When I get turned on, I have to poop. I'm not turned on by pooping or anything of the sort, that disgusts me. It just always happens. It's not just if I'm horny but if I watch porn or read something sexy to get myself turned on it happens. Does anyone else experience this?