Re: one Nut...
It's not that uncommon, I know 3 guys with only one nut
One guy got the testicular cancer.
The other was doing a rail slide on his skateboard and slip, the edge of the board caught the rail and he landed on it, severing his nut.
The third guy was a guy I trained with in Hapkido, he was sparing and both guys went for an inside kick, he got hit in the nut. It swoll up to the size of a grapefruit, then when the swelling went done the nut was gone.