I'm in a relationship with a man, and we're both versatile in the bedroom. But I've found that I sometimes don't last as long as I'd like to before cumming - especially when I am top. I can last a while when I'm on my back and he's riding me (cowboy styley), but when I thrust I tend to cum quickly. My cock is quite thick, and his ass quite tight, which might explain some of the heightened sensation.
Any advice?
Any advice?