First, we don't know if they are really having an affair.SecretDestroyer said:Why deprive her of fully enjoying the only life she will ever have by imposing unnecessary rules. People can manage complex webs of sexual relationships just as easily as they can non-sexual relationships once all of the silly taboos and dogma are removed.
Telling my spouse he could not mess around with people he was turned on by would be equivalent to telling him he could not eat dinner with anyone but me.
Second, some people have open relationships that work, a lot don't.
Don't sit here and argue like your ideas are better/superior than everyones monogamous ideas.