Why would a married man who is having a great sex life with his wife, have sex with another women?

Humans are not monogamous by nature. Men like variety. He is just weaker than their relationship will allow him to be. Was she overweight when they married, I'm guessing not. Men never expect their wife to change, they always do. Women always expect their men to change, they never do.

Couple of points that have already been made stand out as being a good answer. First is how would you know they are having a great sex life? Maybe is horrible or non existent. Second how do you know the other has a tight ..... The weight and the tightness of the other might not be the issue. The first item could be the issue the sex life might not exist at all and he just is tired of it.

Have read many posts here where women state they just dont want sex anymore. What is the man to do just say oh thats ok we will never be intimate ever again? Now what should happen is a divorce and they move on if the women or man has decided to not be intimate anymore but that is not always the decision tha tis arrived upon at the start. So since have no real way of knowing the first part its hard to say why.

A tighter you know what? Seriously you think that is the reason? First off he could only find out if she is tight one way and at that point I think he was committed to cheating.

How do you know he has a great sex life?

I would say that a poor sex life can lead to a guy cheating. At the same time I would say there are some guys who just can’t settle for one.

It is likely based in some insecurity of his or problem in the marriage. You or your friend need to leave him or just accept that he cheats. He can’t be changed and trying to change him or catch him will only make that person look desperate.

You know an awful lot about their sex life and his mistress! Just because one, or both, partner says that the sex is great, doesn't mean that they are being honest! "Oh yeah, you're great baby! (yawn) Yeah that's it! ohh ohh.. G'nite."

Plus the tight thing is really interesting. You obviously know what kind of sex he's having with his mistress.

Sex is a big part of any relationship, but before and after the sex means allot too. Maybe his mistress is just more affectionate, smart, romantic, sexy, funny, etc.

Whatever, it wouldn't hurt to lose some weight either.

Guys cheat (and Gals) cheat for a lot of reasons. One reason I have heard is that the spouse is in his day to day life (pay bills, take out the trash, etc.)

The Mistress is new and exciting. She just tells him sweet nothings.

No. Bringing a third party into the bedroom is never a good idea. It can change even the most stable relationships into something bad. As your wife has just stated its just talk and nothing more. So I would leave it at that and enjoy the idea of the fantasy as you two are having sex.

When I was married, my hubby and I had a WONDERFUL sex life. I did what he asked and pleased him every way possible so that he wouldn't ever feel bored (sexually) in our marriage. Well, that wasn't enough either. He was cheating on me our whole 8 years together!!! Guys are just dogs. Always looking for new P*ssy to try....its in their blood, they're like wild animals and can be VERY hard to tame!!

It's the thrill of cheating and not getting caught. The fact that the other woman is exciting. Weight has nothing to do with it.

After all the other woman is nice all the time as she is not washing his dirty clothes, worrying about bills, working, caring for the kids. She is fun, fun, fun,

Its absolutely ridiculous to be married and cheat if you have a satisfying sex life.....

I love my wife, I wouldnt even think of going astray if she would only make me feel wanted..

All signs indicate this guy cannot be faithful no matter what....And its a given that he is indeed happy and satisfied with his sex life.

It might not even have anything to do with how she looks.

It might have to do with him having some low self-esteem problems. Cause he has to be an a**hole in order to cheat.

And then you have the men that just can't help but to cheat. They like to see just how many women they can have.

Or they like the thrill of the chase. Once the catch is over, the thrill is over.

Or he's just a jerk.