I’ve seen a few guys lament that they aren’t gay or at least bisexual so that they can experience reciprocal desire and have a better shot at sex and relationships. Unfortunately it’s commonly accepted (with research to support) that women are more sexually fluid than men.

https://www.psychologytoday.com/gb/blog/the-truth-about-exercise-addiction/201801/how-fluid-is-male-and-female-attraction

A 2010 survey of college-aged women, for example, found that 84 percent have fantasized about same-sex encounters or have had a same-sex attraction.

By contrast, men’s sexuality is still seen as less flexible. Only 51 percent of the aforementioned college women's male peers reported ever having a same-sex attraction or fantasy. And in Chivers' study, men who identified as straight were less likely to become aroused in response to pornography that didn't correspond with their explicitly stated preferences.

But is that universally true, or does it depend a lot on culture? Another study at Wayne State University and Western Illinois University gave people a scenario of a person alone at a bar and asked them questions about how likely they would be to go home with them:

female research participants in this study were, overall, less willing than male counterparts to engage in any intimate activities with the fictitious person seated at the bar. That reluctance decreased, however, with each successive drink female participants consumed.

Women’s interest in becoming intimate with the fictitious individual at the bar increased with each drink regardless of that individual’s gender — despite the fact that all of the women in this study identified as heterosexual.

By contrast, men’s interest in hooking up with fictitious others remained stable with each drink when that fictitious other was a female. (In other words, alcohol had an insignificant effect upon a male’s willingness to sleep with a woman. They wanted to do so just as eagerly, regardless of their sobriety level.) Men’s willingness to experiment with another male sitting at the bar, however, was responsive to alcohol: The more the men in the study drank, the more open they became to having some type of sexual encounter with a man. Keep in mind that, like the women in this study, every male participant had identified as heterosexual.

The researchers believe that alcohol may loosen the constraints some men place on themselves that, when sober, enable them to conform to the sexual scripts they associate with traditional masculinity.

Were Ancient Greece and Rome an anomaly or are we?

“Weep, you girls. My penis has given you up. Now it penetrates men’s behinds. Goodbye, wondrous femininity!”