[lauriern]

Maybe its as simple as supply and demand. Single women are so rare so that whether is truly single or, married and cheating, it's irrelevant. Where as cheating men are so common.
But seriously, as someone above pointed out, swinging is so complicated anyway that introducing an injuried spouse into the picture is asking for trouble. What gets us is the number of married men who say they are swinging with their wife's permission because a) she has an illness and can't fuck anymore or b) his sex drive is just so damn strong she can't satisfy it, or c) she is just so open minded. But when you ask to speak to said spouse to confirm this arrangement they seem to disappear. On the other hand we know couples who play almost exclusively with cheating males because they feel they have more to lose if they get caught and are less likely to have an STD.