I think you are right that due to societalnpressures many men supress and may not know they are bi. That said i do think the overwhelming majority of straight men are straight. Just looking at the animal kingdom as an example shows that. While gay and bisexual animals in almost every species are common in those cases the straight members tend to show consistently straight mating behaviors.
For men it can be. For women it seems that "no woman is totally straight"
In this study https://www.bbc.com/news/health-34744903 they showed video of attractive men and women, to women.
68% of gay women were mostly aroused only from video of their preferred sex (i.e. women), while only 28% of straight women were mostly aroused only from video of men, i.e. 72% of straight women find arousal also video of other attractive women.
So only 32% of gay women are potentially bisexual, towards the 72% of straight women.
@freemo
> Is it possible they are bi
Everything is possible, especially considering that Marlon Brando and Freddy Mercury, two men with 100% masculine manners, were bisexual. So, how can I answer NO!? :-)
More seriously I believe that many men and women are potentially bisexual, but they don't (want) know this, because they have strong preferences towards the opposite sex, and they have no interest into risking moral judgment from the society. Think to what happens in prisons between men, that probably will have no homo-sexual behavior or fantasies outside of it.
I believe also that a feminine manner or a masculine manner (within certain margins obviously) in a man, is not a a reliable way to predict his sexual choices, in the sense that there can be many exceptions.
@rmx