No, its the fact that she feels its necessary to seek sex outside of marriage to feel better about herself and fulfilled without examining the underlining problem, her husbands self-esteem. When someone does that they are saying you aren't good enough for me and I don't know one person on Earth who enjoys that feeling, not just in terms of sexuality but in regards to anything in there life whether that be personal or professional.
I don't have any moral qualms against what they are doing. As adults they are free to do whatever pleases them, and at the end of the day that is all that really matters.. But this guy obviously has deep feelings of insecurity that are not being addressed properly. His poor sense of self worth and body image are only going to be validated and exacerbated by this kind of activity. The man is going to believe himself defective when in reality he is not. Unfortunate, yes, but not defective. He got dealt a shitty hand, for sure.
your projecting.
it is certainly possible that the guy feels ashamed, insecure, and inadequate. its possible that his wife is a bitch who makes him feel bad by asking to fuck other men.
but its also possible that the two of them are extremely mature people who do not need to feel special or better than other people. They value other people, and enjoy watching each other interact and receive pleasure from those other people.
monogamy is usually based on insecurity. the need to feel special. that your so wonderful that your spouse will never ever be attracted to, desire, or receive satisfaction from anyone else but yourself.
some people want to build a deep, meaningful relationship; they want a best friend to come home to every night and wake up with every morning.... but at the same time they dont need to be the only person to the planet that their spouse enjoys. they dont mind feeling like an equal to other people, they dont mind their spouse experiencing affection and giving affection to others, in fact they enjoy watching and knowing its happening.