Somehow, they're able to rationalize their cognitive dissonance when it's two conventionally attractive women. :/ If you're not familiar with the term, cognitive dissonance is the tension between having two conflicting beliefs, such as being against homosexuality, but being turned on by lesbian porn. A person might feel uncomfortable having these conflicting feelings, so they'll try to rationalize it to make sense (e.g., attractive lesbians aren't as "bad" as less conventionally attractive lesbians or gay men).