myth vaginal orgasm

I'm 37, mother of a teen, I've been with my partner for 2 years and I'm hurting him. He tells me there's a dry spot, a "tooth", a hard part inside my vaginal canal on the side somewhere that rubs him raw sometimes.

And it is only sometimes. It usually happens when he's been stimulating my G-spot vigorously, before sex. When he enters me there's then a spot that isn't as smooth or lubricated as the rest and his penis ends up sore after thrusting against it. It can take days or even weeks for the sore spot to clear up.