"Sexual sadism is another listed paraphilia.
"Sexual sadists are sexually aroused by causing pain or humiliation to another person. Usually this starts as a pleasurable fantasy which eventually progresses to actually acting those fantasies out with another person. The other person may or may not be a consenting participant. The sadistic behavior often includes burning, cutting or scratching, whipping, choking, or biting.
Here's some text from Claire Powells book.....
Jeremy completely swept me off my feet. He was a skilful lover. He taught me how to enjoy sex in a way I never had before, she admitted.
He could also be aggressive and domineering. Julie told her girlfriends that he liked to feel in control and on one occasion he covered her arms with bruises and bites so they could be clearly visible to their friends. The message was unmistakable: Julie was his property, and she acquiesced without a murmur.
My point here is that JB had an 'aggressive and domineering' nature.