This is most likely the explanation. Apex predators will often try to kill the seed of an enemy by tearing off their junk. It's much less dangerous than trying to kill the enemy, and it serves the same purpose of ending their genetic line.
The first scavengers or predators on the scene will evaluate your condition and attack the softer parts of your body. That includes your anus and genital area, your stomach/gut area, your eyes and neck. It is in your best interest to cover those areas as best as possible. Those animals will try to create injuries that are serious enough that you will not survive so they go for the soft parts.
Buzzards are known to start at the anus/genital area and move into the gut area. when they are cleaning a carcass. Same with larger prey animals. Use your resources and energy to protect the soft parts and you will improve your chances of survival. Duck and cover by assuming a fetal position can work if you can maneuver your backside into a sheltered position where it is less accessible. Cover your ass in other words. When fighting back you should remain facing the threat with your rear covered.