60% said that swinging improved their relationship; 1.7% said swinging made their relationship less happy. Approximately 50% of those who rated their relationship "very happy" before becoming swingers maintained their relationship had become happier. 90% of those with less happy relationships said swinging improved them. Almost 70% of swingers claimed no problem with jealousy; approximately 25% admitted "I have difficulty controlling jealousy when swinging" as "somewhat true", while 6% said this was "yes, very much" true. Swingers rate themselves happier ("very happy": 59% of swingers compared to 32% of non-swingers) and their lives more "exciting" (76% of swingers compared to 54% of non-swingers) than non-swingers, by significantly large margins. There was no significant difference between responses of men and women, although more males (70%) than females completed the survey. This study, which only polled self-identified swingers, is of limited use to a broader application to the rest of society (external validity) owing to self-selected sampling.