I don't think more soft swing couples have marital problems, but I do think that there can be more drama since many are testing the waters and don't know what they are okay with and what they are not. Jealousy and drama ensue.
I can say though that one soft swap couple we played with was a very, very hot experience. Watching them have sex was incredible. There is a whole different dimension to watching a couple that is totally in love and knows each other's buttons having sex. The look of passion in their eyes, their movements. It's hot, sexy, and romantic all rolled-up into one moment. We'd like to experience it some more.
Mr. WS