These quotes particularly caught my eye
Swinging is primarily a social activity, and the ordinary social customs of being courteous, initiating conversation, getting to know people, and letting trusted acquaintances become friends are no different from any other walk of life. Put another way, it's your ability to form friendships with couples, as a couple, that will ultimately determine the quality of your experience in the swing community.
``About 85 percent of both husbands and wives feel that swinging is not a threat to marriage or love between spouses. None of them reported that their marriage became worse since they began swinging, and the majority feel their marriages have improved. ... Many swingers reported that rather than dampening their ardor for each other, swinging often caused an arousal of sexual interest for each other. Many of them often engage in sex together immediately after returning from a swinging party.''
Venusxxx