Are you sure you understand what "correlation" means?
A correlation is an apparent relationship between two variables; in this case intelligence and degree of sexual deviance.
Reaper asked the question "isn't there supposed to be a corollation between high intelligence and sexual deviance?"
He is not stating that it is the case, nor has he drawn any conclusions from it.
Whether or not it is the case, a visible correlation between intelligence and sexual deviance would only indicate that one seems to vary with the other. In other words, as intelligence goes up, so do the chances of sexual deviance (in a measured population, not in an individual). It doesn't tell you how or why this relationship exists, nor does it have anything to do with people calculating pi while they are having sex.
I think as far as this thread goes the question is why do those things make it more enjoyable for some people and not others?