I have a number of female friends and colleagues , in their forties fifties and sixties, who have embarked on affairs for a number of reasons and not been found out.
Many are in dull sexless marriages, a couple are swingers too,but the affairs are seen as life-enhancing, fun, revenge, a host of things. None of the women want to leave their husbands , the sex in the affair is generally good, and for some of the women it has been 'liberating' in that they are having the ''kind of sex men have and fucking enjoying it''
I spoke to a male nurse, now in his fifties, straight, never married. He has been in a couple of long term relationships, but when single he slept with dozens of married women. he said that for him it was uncomplicated, and for the women it was almost entirely a positive thing. All but one of those women is still married to their husband, none of the affairs were discovered.
He thinks, and has been told, that he was a sort of light entertainment and less of a guilt problem as he was not in a relationship himself.
The women appeared to compartmentalise him as men are supposedly meant to, and the one time he found himself getting more than Friend with Benefit feelings towards one of the women she dropped him fast.
I can understand some negative reactions to this thread but the reality is that for many people sex can easily be removed from emotional entanglement, can be recreational, and extra marital sex can save a marriage.