well smoking pot does decrease your testosteron production, so that could be the cause, i know i got it every now and then, but it was from my pants sucking up around it, or just how i was sitting. but every now and then there would be times when it wasnt either of those, because i was in boxers and sprawled out on my couch smokin.. i kind of thought it might be because its stopping the production of that... but who knows.. just play with them a little and adjust them, get a girl to do it for you, and you will forget all about it hurting.