I was once told that the higher the level one achieves in education, and /or the higher the level of intelligence, the more likelihood for that individual to participate in kinky sexual behaviour.

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I can't say as to that. There are many kinds of pornography, though, (cartoons, photos, films, fiction etc) and it seems likely that those of us who believe that pictures usually don't turn out to be worth a thousand well-chosen words probably are, on average, somewhat more literate than the populace at large.

But there is a huge range of writing styles, appealing to all tastes and all levels of education, on this site alone.

With regard to personal behavior, I doubt that one's level of intellectual attainment, if any, has much to do with the formation of sadistic or masochistic impulses. It might be that familiarity with the literature and history of such people, might make a better-read person more likely to be vocal about his tastes, thus giving the appearance that BDSM practitioners were better-educated than average.

But I suspect that there is as much kinky activity among "the masses" (particularly non-consensual kinky activity) as among those who take the time to read and write about such things.

Boccaccio