How are the people in this club any different from you and me?

They

- integrate poorly with society

- can't get laid without some bizarro ritual like a swingers' club

- suck at making friends

- view the "external world" as uniformly hostile.

The real point of these events seem to be more about free expression than free fucking.

...been to one?

The sex seems almost secondary to the comfortable atmosphere these people are seeking to indulge a thing they love.

...been to one?

It's no more "us" versus "them" than a book club, or an AA meeting, or the Girl Scouts.

...been to one?

The community is emphasized, the fucking is optional.

Right. So that people such as yourself can read something like this and go "oh, casual sex clubs are just like bridge clubs, only with fucking."

While I've never gotten an invitation, I can say I'd jump at the opportunity.

Go find one. They're not hard to locate. Be prepared for disappointment.

What faults could these people possibly have to hide?

In addition to the faults listed above, they also tend to be fuggly. I could have put that nicely, but they tend to be fuggly. They kind of select for fuggly - I've known pretty girls within that community and they either select out due to undue attention or they gravitate into the paid BDSM universe.

I've known four BDSM "models." Three of them dabbled in the swinger community. How many have you known?

I hope this drives home the point without being obnoxious - you're all about the wondrous world of the swingers' club in theory while I'm pretty much down on it in practice.