I do not know if swinging is mentally harmful... But imho, why be married if one wants to swing with other partners? Marriage is a commitment to each other... and it doesn't mean "sharing" our partners in bed with other folks..........Marriage has no meaning, in my opinion, if they are openly sleeping with other people....... I am not judging.....

I know for myself, if I were married I would not want my husband in bed with another woman....... Nor would I want to be with another man......Swinging just takes the whole meaning out of marriage........ But each to their own....