Lately I have been experiencing some type of vulvar pain halfway through having sex with my boyfriend. I don’t really understand because I’d be fully lubricated and am enjoying the moment, and just out of nowhere I experience pain around the opening on my vagina. I will say this, compared to my past sexual partners my boyfriend has more girth and does last longer. Before, we used to have multiple rounds of sex. Now I can barely make it to the second round. What could be the cause of the pain?