I had similar symptoms and it turned out to be caused by two ovarian cysts. Anytime we had sex I would have sharp pains. My husband is large and likes to pound it. It got to the point that any slight penetration caused pain. One night I started spotting and the pain was so bad that my husband took me to emergence. After two vaginal exams (I hate hospital exams) a Gynecologist was called and she examined me and really pushed her fingers in and felt my abdomen. She determined that I had 2 small masses in my ovaries, after another exam where another doctor inserted a vaginal probe; anyway after evaluated the test results the Gynecologist recommended that I have surgery to determine if the cysts were cancerous/malignant. They were found to be early stage cancerous . The two cysts were removed and after some therapy I am now considered cancer free. The only thing I dislike is that I have to have vaginal exams every six months and two specialistís exam me. I feel like every one at that clinic has had a look see at my kitty. I can tell you that I really have one sore vagina after each visit!
My advice is do not fool around with this condition and get evaluated ASAP.