I have recently been getting really intense muscle tensing after sexual activity. The muscles in my back, upper and lower and seemingly moreso on the right side get really tense. I also get some pain in my groin and my legs weaken. Its starting to make my life a nightmare. I don't know if its muscle related, I dont exercise and have not had access to hot showers all the time recently. The symptoms will last a few days afterwards, so pretty much its constant. If you have any information please post, thank you.
Oh, and I am a 22 year old male