It could probably be summed up to: Stronger preying on a weaker. I've had bitches like these submit to me, and they've been used to having their own way with males before that. It only works until they meet a stronger individual. Then it either doesn't work out and she proceeds to search for a weaker, or submits to a stronger man and becomes a filthy bitch/fucking toy, ready to please the master.
Btw, being an egoistical and narcissistic bodybuilder is a lot easier to weed out these types, as they are.....egoistical and narcissistic also. Hope this helps.