This classic study, published in the Journal of Abnormal Psychology in 1996, used a delightful technique called “penile plethysmography” to measure porn-induced “tumescence” in men who self-identified as “exclusively heterosexual.” Its abstract concludes: “Homophobia is apparently associated with homosexual arousal that the homophobic individual is either unaware of or denies.”

More fun facts:

In the homophobic group, 20% showed no significant tumescence, 26% showed moderate tumescence, and 54% showed definite tumescence to the homosexual video; the corresponding percentages in the nonhomophobic group were 66%, 10%, and 24%, respectively.

Think about it. Of the penises belonging to this group of straight-identified homophobic men, 80% got more engorged while their owners were watching gay porn. Eighty percent. Of those belonging to non-haters, about a third did. Think about that, homophobes.