Swingers Clubs are frequently not illegal.
Swingers Lifestyle Clubs can be establishments that provide a venue for sexual liaisons between couples and or singles.
It has freqently been said The Lifestyle's attending swinging parties and exclusive events hosted by swingers. According to most The Lifestyle's primarily a social activity.
Some reports have even stated that Swingers are not cheating though. Lifestyle Clubs are only indecent if they're actually doing any harm.