I have had this. Actually two of my football teammates too. I didn't think it was a common side effect but I guess it's a bit more widespread.\
For me, I would describe the pain as more of a lingering pain that you really feel when you make solid contact (like during bathing or some serious scratching).
It kind of feels like you got kicked in the nuts, more of a glancing blow, but the after effects, like the hour later feeling.
For one of my teammates, he described his pain to be even worse. I told him that it always passes within a couple of days (as it did for me), which looking back, I guess did for him too. I didn't hear anything more about it after I spoke with him.
It only happened to me a 1st few cycles, and not every cycle. I couldn't (now looking back) pinpoint if it was at the begining, middle or end of cycles. I do remember 1 bout of it during PCT though?
Anyone else?