Nothing wrong with living your (sex)life the way you want. But sharing that kind of private information with your children?

Well I'd say that they probably don't know what's it's about or they are pulling your leg. Why would they tell you the club's name otherwise? You're bound to find out...

27- In that sense, I guess it wouldn't be considered "cheating". But I think most people consider "cheating" as having emotional/sexual relations with someone that isn't your significant other, which is what we were referring to.

Just hold that mental image of your lovely mother, the woman who baked you cookies and kissed your forehead to check for a fever, on her knees, getting violated by three strangers, seven different ways to Sunday. And your father, the man who played catch with you slamming some strange woman up the ass as he fondles her breas..... *Ahem* Sorry, got carried away. I'm sure everything will be fine.

Uhm, no, you are not. Quoting Wikipedia: "Cheating refers to an immoral way of achieving a goal. It is generally used for the breaking of rules to gain advantage in a competitive situation." Since OP's parents both agreed on going to a swingers club to have a jolly good time, where is the cheating-part? The immoral way? The breaking of rules? Right, nowhere.

Wave a black light wand over them when they come home. Eww....

What makes you think they didn't have this information already...

Maybe there are two clubs with similar names or you found the wrong one online? Or your parents could be trolling you. If your parents are comfortable telling you about the club then you should be mature enough to ask them about it.

Fair play to them. They're not harming anyone.

It's not cheating if both halves of the couple are completely alright with it. Have none of you ever heard of polygamous relationships? As long as everyone in such a relationship knows the score and is genuinely okay with it, that's not cheating. And don't bother telling me I'm wrong, I know some people in polygamous relationships and they're very happy (except for one girl, but that's just because she chose absolute dicks every time). As for swingers' clubs, the people in each couple are agreeing to it so how is it cheating? What counts as 'cheating' is completely dependent on the people within the relationship; do you class a threesome as cheating? Swinging is no more cheating than a threesome. Some people would class fantasising about another person cheating, some do it as a normal thing. Some people like to let others watch, some would class that as unfaithful to the relationship. Some couples would consider experimenting sexually with 3rd parties, some wouldn't. You don't get to decide the universal definition of cheating.