I used to have a vasectomized hob & castrated hob in the same hutch with six jills, the vasectomized hob used to try to mate with the castrated hob. Tried to separate them but the castrated hob used to pine for the other ferrets.
In the end, I made a concoction of chillies, tabasco sauce, clove oil and black peppers. When the hob came in to season, I used to rub a little of this oil on the neck fur of the castrated hob. It took a few goes but the vasectomized hob stopped bothering the old boy. I would not recommend this to anyone, just recalling what I did, god only know what would happen