I have stopped my wife from fighting several times for various reasons. What can I say? She has a hell of a temper. A couple times she was furious with me for stopping her, but I did anyway. Mostly because I love her and would not want to see her hurt or embarrassed and to be honest most of the fights were about something silly that I am sure she would regret fighting over later. At the same time, I dream of her doing some kind of controlled match. For some guys, their wife winning is important. For others, they want to see her loose. Then there are guys like me that win, loose, or draw would love it. I am sure for each of us there is probably some deep seated psychological reason for it. I don't think for the guys who would like to see their wife loose, they would be disappointed to see her win. I suspect it falls under the "Damsel in Distress" wing. The guys that want to see their wife win might fall under the "Dominatrix" wing of our obsession. As a fantasy, I think it is hard to say one is "Better" than the other or any "Worse" than any of our fantasies. I would hope that win, loose, or draw, if our wives were willing to entertain this fantasy we would recognize we are extraordinarily lucky and properly worship the ground they walk on.
On the flip side, anything can be taken too far. if your hiring some thug to beat up your unwilling wife, or allowing her to be unnecessarily hurt in an actual fight, there is something seriously wrong and you probably should consider some professional help.
As far as my wife telling me it was a turn on to see me loose a match, I don't think I would be particularly offended. I think I'd be happy that I turned her on. I have won and lost fights with much less reward than that. Now if she said she wanted to see me get the hell beat out of me by the Hells Angels... don't think I would sign up for that one.