it's either sexedwrong or what we call "snake rape" which is obviously VERYstressful for the male being dominated.
Why are you co-housing bal pythons?
Why did you not check the sexes of your animals before placing them together?
It sounds like he was sorting snakes and put a couple together while doing so. I don't think they were housed together full time. It might not be a bad idea to sex them again though.