Hi! I have obviously been out of touch with the web site for the last 2 ½ weeks.
Without any skin changes and given the generalized genital/groin distribution of your burning, I do think that anxiety accounts for some if not all of your symptoms. I cannot think of a physical cause. Why sexual activity is a “trigger” is not clear and needs an expert (psychiatrist/psychologist/psych-social worker) to help figure out what is happening and how it can best be treated. Prostatitis does not act this way, though often patients are labeled and treated as having such. I do think that you should first be evaluated by a urologist to look for any local issues before proceeding for the emotional evaluation.
S.A.Liroff, M.D