The Psychoanalytic Roots of Homophobia
Using a penile plethysmograph (PPG), the following paper (summary here) reports that sexual arousal of homophobes is greater than in non-homophobes when viewing homosexual sex. They also tend to admit to far less arousal than the PPG reports. Could be just anxiety rather than suppressed homosexuality, but interesting nonetheless.
Adams, Henry E; Wright, Lester W. Jr; Lohr, Bethany. 1996. "Is Homophobia Associated With Homosexual Arousal?", in Journal of Abnormal Psychology, Vol. 105, Iss. 3, August 1996, pp. 440-445.