Would you watch somebody you or she really dislikes fuck your wife

Once when my wife and I had a slight tiff and she was a bit put out by my attitude she took revenge by fucking my cousin. He had always fancied her so he was an easy pull. She knew he was someone I really despised and the last person I would want her to fuck. She went round to his flat and spent the night fucking his brains out. The following weekend when I saw her again she told me all about it expecting me to be rather irked by her actions. Instead I was incredibly turned on which surprised her. We talked about it and she told me all the details which got me very horny.

For me it was the fact that she was prepared to fuck someone she didn’t really like herself given enough motivation that gave me a massive hard on. Needless to say to say we solved our differences with her bent over the sofa taking my cock and a spanking.

I have since reminded her of these events when I have asked her to fuck someone and she says she is not sure she likes him.
 
As far as someone I hate, I kind of already answered this in the "sex after sharing" thread with an experience, and I didn't like it:

Sometimes yes but it's definitely not related to a feeling of jealousy or spite. Actually there was a time when we were maybe 2 years into dating. She was probably 23 at the time and we were at this house party. Everyone was young, drinking, and partying. We were already in the lifestyle with an open type of relationship. A bunch of us went out to a bar/club did a bunch of drinking and then came back. I was looking for my GF knowing there was a good chance she was fucking someone because she was drinking and told me earlier she was horny and planned on having sex.

Anyway I go upstairs and walk into one of the rooms and see my GF on her knees getting her face fucked really really hard by a guy who I fucking HATED. And behind them I saw a guy laying in bed like he was asleep but his eyes were clearly open like he was watching. As he was ramming his dick down her throat he turns to me and just gives me an obnoxious grin.

There is a bunch more to this story but to keep a long story short I was not at all turned on by it and did not have sex with my GF that night. I definitely had some kind of an anger and maybe jealousy issue with it but it definitely did not turn me on.

As far as someone she hates, I guess it wouldn't bother me. She is into being submissive and rough sex so guys will often act like they hate her when they fuck her and call her names and such and it doesn't bother me. I'm quite sure she has fucked guys she hates actually. And she'll often annoy or ... off some guys as almost foreplay before sex to anger them and make them mad at her so they'll discipline her I guess. So I don't think that would bother me.