Hmmmm....I'll have to visit this section more often.The political section can get very depressing sometimes...
Couples swing for different reasons,I suppose.
Some swing because they are not happy.And I'd say these couples won't stay together for long.Eventually one or both would meet someone more interesting and satisfying (not only sexually) and move on...
Others swing because they are very much at home with their partners,but want to eat a new dish every now and then,to keep the analogy of this thread going.This probably makes their realtionship more secure,happier and more exciting...And increases their committment to each other.
Each to their own. I don't think we should bring morality into this.
As Jane says,if swinging is not for you,nobody is forcing you...
If I were happily married with children,I'd think twice about doing it,as it would always contain some risk of break-up...Since I've never been happily married,that dilemma has never arisen...