In the case of cuckolds,straight men have fantasies where their wives are having sex with another man either in his presence or not but with his knowledge. Other men fantasize and/or engage in sexual activity with another man’s female wife with the husband present and watching or not but with the husband’s knowledge and awareness.
According to the Oxford English Dictionary, a cuckold is, “a derisive name for the husband of an unfaithful wife.” The concept of being a cuckold is that a man’s wife or girlfriend is interested in being with another man, usually because she complains of her husband or boyfriend not being sexually satisfied enough by him, thus needing another man. Often the other man is bigger endowed and from this the male partner is humiliated and shamed for not being able to satisfy his women as this man can. Usually these sexual fantasies involve the women being sexually dominant and forcing their male partners to watch and/or participate in the sexual acts.
Either way the men involved in cuckold fantasies need a woman to be involved or they are left cold. In other words, if women are not part of the sexual fantasy or a man is a known gay or bisexual the men are often turned off. The erotic part of the fantasy for these men is that both are heterosexual.
Some argue these men are gay and/or bisexual and in denial–and some are. The truth is that while these men exist there are too many who truly are heterosexual and enjoy the homoeroticism of another male present for various psychological reasons–none of which have to do with homosexuality.