An illicit swingers club called Club Butterfly (1999) is the last step on a path to marital betterment in this steamy couples drama from South Korea. Kim Sun-Yong and Kim Young Ho star as the troubled married pair whose difficulties in the sack lead them to explore an impressive array of potential cures. The elegant Sun-Yong reveals plenty of skin in bedroom acrobatics with her lustful husband, but it isn’t until a sex guru turns them on to the mysterious Club Butterfly that they find compatibility for their desires.