Joined when I was a young teenager ( a long long time ago) but when I met the other, mostly adult, members at meetings they were some of the dullest people you could imagine. Once they'd finished discussing their IQ scores they didn't seem to have anything to say. Still it got me my first visit away from home without my parents, all the way down to London - to the annual MENSA party or something of that sort. And I'm pretty sure if it had turned to an orgy I'd have noticed something (?)