Are straight men who get off on women using dildos on them and fantasize about gay sex repressed homosexuals? Or are they just straight men who are getting off on the "kink" or gay sex?

I think the title pretty much says it all, there are people who are straight in their relations, attracted to and in sexual relationships only with women, but like to have strapon dildo sex and get off on fantasies of gay sex. But never have sexual encounters with men, or crushes on men. Could it be that these people are repressed homosexuals, or maybe they are just getting off on the taboo of gay sexuality?