My boyfriend is uncircumcised and if we don't use lube, the skin that's connecting the foreskin to the head of his penis will rip. It's healed now and we literally cannot have sex without lube because it will happen again, if we do anyways it will rip and he can't have sex for 3 days until it's fully healed because it's really painful for him. He says I am the only woman this has happened with and apparently it's because I'm extremely tight. He says it has to do with me being a really small person which I am, I'm only 4'9 

I was wondering if this happens to anyone else? I don't know anyone else who's with a guy that is uncircumcised so I don't know who to ask.