No, not ignorance; it's sheer fright. They are terrified someone might espy the broad gay streak in each of them.
Research by U.S. psychologists suggests that 80 percent of men who are homophobic have secret homosexual feelings.
In tests by Prof. Henry E. Adams of the University of Georgia, homophobic men who said they were exclusively heterosexual were shown gay videos. Four out of five became sexually aroused by the homoerotic imagery, as recorded by a penile circumference measuring device, (a plethysmograph).
Prof. Adams's research was published as Is Homophobia associated with Homosexual Arousal? in the prestigious U.S. Journal of Abnormal Psychology, (1996, Vol. 105, no. 3, pp. 440-445).
Prof. Adams says his research shows that most homophobes "demonstrate significant sexual arousal to homosexual erotic stimuli", suggesting that homophobia is a form of "latent sexuality where persons are either unaware of or deny their homosexual urges".
These findings support the theories that homophobia (fear of gayness or support for antigay discrimination) is often indicative of repressed, self-loathing, homosexual feelings; and that many homophobes subconsciously use antigay attitudes as a smoke-screen to disguise their own homosexuality.
As for poor old @cedorsmulas: anal sex is the most common form of heterosexual activity worldwide, as the cheapest and most convenient form of birth control.