The reason is three fold.
First, their is a real question of are they really lesbians? They are really actors paid to engage in lesbianism on camera. Often they have previously had sex with men in other films. They know they are being filmed and know men will watch, if not be the main market. They are willingly participating in a sexual act exhibitionism/voyeurism between two women and the guy. They've agreed to this strange, e-threesome, and that implies he has a chance with them.
Second of all, you are seeing two nude women. Guys like multiple women - especially as part of you may be thinking you have a chance with them both!
But even ignoring that, watching two women make love avoids a major problem for some men. When you watch another guy make love to a woman, you will be sexually excited while looking at a naked man. If you are not bisexual yourself, this can create some dissonance. For a second you were sexually excited while looking at a man's behind, or worse, a penis. That can raise questions in your own mind about your sexuality. Or if you honestly have zero homosexual tendencies, this may turn you off, ruining the experience.
First, their is a real question of are they really lesbians? They are really actors paid to engage in lesbianism on camera. Often they have previously had sex with men in other films. They know they are being filmed and know men will watch, if not be the main market. They are willingly participating in a sexual act exhibitionism/voyeurism between two women and the guy. They've agreed to this strange, e-threesome, and that implies he has a chance with them.
Second of all, you are seeing two nude women. Guys like multiple women - especially as part of you may be thinking you have a chance with them both!
But even ignoring that, watching two women make love avoids a major problem for some men. When you watch another guy make love to a woman, you will be sexually excited while looking at a naked man. If you are not bisexual yourself, this can create some dissonance. For a second you were sexually excited while looking at a man's behind, or worse, a penis. That can raise questions in your own mind about your sexuality. Or if you honestly have zero homosexual tendencies, this may turn you off, ruining the experience.
