I'm not married, but if I was:
I guess I'd feel sad/hurt if I discovered she was cheating on me.
Then I would want to know why. If our relationship wasn't working, we'd need to address that. A lot of women seek affaairs becasue they are not happy at home (whereas guys just like variety for the most part).
If she loved me and wanted me but was a nymphomaniac who wanted more action from fu-- buddies, then I'd say "OK, but I get to do SP's - fair is fair". I don't mind an open relationship if it is centered in love and commitment. Maybe I'd suggest joining a swingers club, having threesomes, etc. There would be an appeal of sorts in knowing I could do any cute SP without fear of being caught and just say "Well, you do the pool boy, so what if I did an 18-year-old hottie over lunch? Sure, I did her - I thought you liked open relationships - I'm just being open...you
asked how my day went...
It all boils down to is she cheating becasue she no longer loves me/wants to be with me and wants to run off with the other guy (ie she's a bolter), or is she happy to be married and love me (and the kids) but just wants to foolaround for fun in a series of meaningless romps just for added sexual pleasure/entertainment. If it is the former, than the marriage is toast; if it is the later, well, if she is a good wife, good in bed with me, keeps house and is a good mother to the kids...I'm not going to throw it all away just becasue she is extra horny and likes the occassional trist with some guy she fancies. I'd say "bring a secret video camera in your purse and film the encounter, then we can watch it as an aphrodesiac before having sex ourselves one night. If there is more than 25 years age difference between us, I'd be even more inclined to shrug it off.
What every guy fears is the coming home to the conversation that goes: "Our relationship isn't working...I've met someone else. It's (insert one of) your brother, your best friend, your boss, MLAM, etc. We're running off together. Goodbye."
Of course I'd prefer a marriage to be one where she adores me and would never cheat, and I satisfied her needs, and she mine. I'm just saying that I'd rather have her bed bouncing and happy than unhappy and sighing round the house all day.