Stank Dick

I'm pretty sure my boyfriend has stank dick, but I'm not entirely sure. I've had an STD before so I know what to look for. but after we had unprotected sex I secrete this garbagey odor, and I think it's from his dick cause I don't smell like that alone or with other people. and he keeps telling me I need to wash better, but I KNOW how to wash my own body.