According to the Journal of Personality and Social Psychology, empirical evidence shows that homophobia is partly the result of the suppression of same-sex desire. In other words, homosexual urges, "when repressed out of shame or fear, can be expressed as homophobia."

Using this methodology we identified a subgroup of participants who, despite self-identifying as highly straight, indicated some level of same-sex attraction (that is, they associated "me" with gay-related words and pictures faster than they associated "me" with straight-related words and pictures). Over 20 percent of self-described highly straight individuals showed this discrepancy.

Notably, these "discrepant" individuals were also significantly more likely than other participants to favor anti-gay policies; to be willing to assign significantly harsher punishments to perpetrators of petty crimes if they were presumed to be homosexual; and to express greater implicit hostility toward gay subjects (also measured with the help of subliminal priming). Thus our research suggests that some who oppose homosexuality do tacitly harbor same-sex attraction.

What leads to this repression? We found that participants who reported having supportive and accepting parents were more in touch with their implicit sexual orientation and less susceptible to homophobia. Individuals whose sexual identity was at odds with their implicit sexual attraction were much more frequently raised by parents perceived to be controlling, less accepting and more prejudiced against homosexuals.