René Descartes (1596-1650) was one of the foremost figures in philosophy and mathematics; responsible for his interactive dualistic theory of mind-body relationships, his proof of his own existence ("Cogito, ergo sum), his work in optics, and his discovery of analytic geometry. He was, in many ways, the Renaissance man of his time.
He also had a little secret: he had a fetish for cross-eyed girls. He admitted to as much in one of his philosophical works: when he was young, he was in love with a Madamoiselle who possessed such a feature. As he got older, he maintained a generalized preference for cross-eyed girls. Interestingly, he found that his development of awareness of his prediliction's origins helped him to stop having it.
Too bad for 17th-century cross-eyed chicks.