I and my sisters and a few other girls i know live by one rule, if the married man, chases the mistress or another woman, then it technically would not be fair to fight her. However if the woman knowing the man is married not only Perseus but refuses to let up, then she will have a fight on her hands for sure.
Saying the mistress wins is a part time fantasy in reality, cause when a pissed off wife/gf gets cheated on the level of anger that woman has , leaves many a mistress with her boobs clawed up, as well as face and hair torn out by the roots. Not saying the wife or gf will always win , but anger is a hell of a powerful friend going into a fight for ones man. Personally in my irl i only had to fight for my man once, we were still dating, and he tried to avoid me getting into a fight and told the bitch to walk away, but her and i got into it and i tore her up. The second time we was an arranged irl match, and against my better judgement i agreed to the stakes of winner gets losers man, sadly i lost the match and i watched her straddle my hubby and i lost it and tore her off him by her hair, after a quick exchange the guys tore us apart but i was ready to devour the bitch. Try to remember in your fantasy a wife can be a mistress as well.