I too would get that. It's weird. Sometimes it's a strong ache that actually start in my rectal area.

literally thinking too much about sex makes me have cramps

This has been happening to me lately also. I didn't have this pain before I had my first lap. I think it may be from pelvic floor dysfunction. I have surgery in 16 days so I will let you know if I find anything out!

Ya exactly wish I knew why it happens.

Not alone, I never wanted to orgasm because of the pain, or think about anything because it hurt. But exercise helped with that. It is not all gone, but it has gotten better. I don't understand why it happens and why this has helped me. Dots don't add up.