Ok, I'll admit it, I had to look this word up, a person who is turned on by intelligence.
It definitely has some bearing on how attractive I find a person although they don't have to be a super brain, in fact that could put me off as I although I see myself as reasonably intelligent I'm not a high flyer and my general knowledge is pretty average. I do find a person who can carry out stimulating conversation on a variety of topics attractive but that in itself wouldn't draw me to them. I have to find them physically attractive too plus they need a sense of humour, I think it has to be the whole package. I have friends who I have some really interesting conversations with that I am not sexually attracted to at all so it's only a small part of the attraction. An interesting question though.