I,ve just introduced a hob and jill to an existing jill, The hob has been castrated which will make a big difference, but I always allow mine the freedom of the garage for an hour or so a day to socialise and play, after a couple of hours the exploration was over and they settled down fine.
As for Millet not experiencing hobs dragging jills around by the scruff of the neck I can tell you he is lying. Where he comes from that is standard courting between male and female humans
Roache