From the article in Scientific American:

I may have failed as a homophobe, but unfortunately, many people succeed. And it turns out we may have something in common—many young, homophobic males may secretly harbor homosexual desires (whether they are consciously trying to deceive the world about them as I was or not even aware they exist). One of the most important lines of work in this area dates back to a 1996 article published in The Journal of Abnormal Psychology. In this empirical paper, researchers Henry Adams, Lester Wright, Jr., and Bethany Lohr from the University of Georgia report evidence that homophobic young males may secretly have gay urges

Fascinating, eh? It explains so much.