I experience intense pain during sex. Please advise on the problem.

Hello doctor,

I need some advice on an ongoing problem that has my doctor stumped. I am experiencing intense pain during sex, to the point that it often entirely prevents intimacy. This has been going on for about 12 months. The pain is consistently in the same spot, just behind my hymen to the right. It is not cervical or abdominal, does not shift, and is not linked to any vaginal contraction. It is worst immediately upon penetration. I am a lady with a very high pain tolerance, but initial penetration has me screaming/throwing my partner off me at the moment. If I am able to battle through the first minute or two, it starts easing. I am not generally intensely sore (beyond the usual little ache) after sex, and the whatever-it-is does not usually make itself known outside of sex (even when I sit down hard/use the bathroom), although there have been perhaps four to five little twinges over the past 12 months when I have been walking around.

I have had two doctor's appointments about this previously. On the first, I went through full STD testing to eliminate a disease or infection, but all tests came back clear, including BV. On the second appointment, I went in for a pap-smear and visual inspection of the spot. Pap smear was negative, and the doctor was only able to say that she could see a 'pink irritated area' in the location. I described the pain as being centered - no cysts/polyps/tumors/notable textural difference/cuts/scarring/injury to my hymen. I am self-lubricating relatively normally and using lubricant when I do not. I am not experiencing any contractions upon penetration. The painful spot is consistent whether I am with a partner/using a sexual aid/touching it with my fingers. It does seem to ease somewhat when it has been seven or more days since I have had a sexual encounter, but every time after the first time following a break it is as painful as ever.