This may have been posted but there is now scientific studies with evidence that homophobia covers

[Jackpine Radical]

2. There is of course the old 1996 Adams PPG study

that came to essentially the same conclusion…

Is Homophobia Associated With Homosexual Arousal?
Henry E. Adams, Lester W. Wright, Jr., and Bethany A. Lohr University of Georgia

The authors investigated the role of homosexual arousal in exclusively heterosexual men who admitted negative affect toward homosexual individuals. Participants consisted of a group of homo- phobic men (n = 35) and a group of nonhomophobic men (n = 29); they were assigned to groups on the basis of their scores on the Index of Homophobia (W. W. Hudson & W. A. Ricketts, 1980). The men were exposed to sexually explici terotic stimuli consisting of heterosexual, malehomosexual, and lesbian videotapes, and changes in penile circumference were monitored. They also completed an Aggression Questionnaire (A. H. Buss & M. Perry, 1992). Both groups exhibited increases in penile circumference to the heterosexual and female homosexual videos. Only the homophobic men showed an increase in penile erection to male homosexual stimuli. The groups did not differ in aggression. Homophobia is apparently associated with homosexual arousal that the homophobic individual is either unaware of or denies.

The whole study is available as a pdf here:

my.psychologytoday.com/files/u47/Henry_et_al.pdf?