"Interesting topic, with some history, biology and sociology being combined. However not as strong or focused on real life experiences as I would have hoped
You are either gay, or your straight, or you are lying

I feel Ace: What Asexuality Reveals About Desire, Society, and the Meaning of Sex did this better in respect to asexuality, definitely an interesting read but could have been more impactful and in-depth. There are definitely a lot of interesting facts in Bi: The Hidden Culture, History, and Science of Bisexuality, like: 0.5% to 3.1% of the population identifying as bisexual, include quite a few of the 10.000 men being in nazi camps for being gay.
Also the Dutch COC being mentioned as possibly the oldest LGBT organisation in the world was nice.

The whole "bisexual people were seen as sleeping with the enemy" and debate of essentialism (born this way) vs social constructivism (formed by experiences) is interesting if sometimes a bit esoteric, and I don't understand how a statistic quotes as 8% to 25% of sexual orientation being genetically wired was researched.
Actually a lot of the earlier sections of the book are about homosexuality, with observations like:
- 17 male-male giraffes mounted each other and 1 heterosexual pair being observed, being extrapolated to 90% of giraffes are gay
- Domesticated rams have a c. 8% persistent preference for other rams
- Gay for the stay, referring to sexual activity changing when the sex ratio in populations are strongly skewed
- Bonobos having 30 socio-sexual (e.g. for fun or relaxation) interactions per day and almost no intra group aggression.

When we get more to the modern era we have a bit more on real people, like bi people being half as likely of being out than gays or lesbians, especially applicable for bi-men, and 4 out of 10 bisexuals in UK not being out in their work.
Modern day culture wars don't help off course: She says she likes both, because she wants to hop on another woke bandwagon - modern day biphobia

Double discrimination by both straight and gay people, with experiments showing that bisexual people are allotted a 15% lower starting salary and a lower starting salary than gay potential employees and bisexual women being victims of sexual violence much more often than either lesbians or straight women.
And still visibility is a big topic. What do bisexuals look like? A research on how heterosexuals and gays have a perceived style while bisexuals didn’t have a particular style that came to mind for a public surveyed.
Lack of bi-spaces, where people feel they are the majority and sexual orientation doesn’t need to be discussed at all.
And bi identity being overwhelmingly white, lacking intersectionality.

I missed a bit of the view from the ground, with normal lives of bi people in the picture (besides that of the author), which Ace does expertly for asexuality. Observations like only 60 bisexual politicians registered from 1977 in the whole world say something, but if they are so marginalised it might have been nice to have spoken to them and give them a voice in this book.

A lot of the latter part of the book are more about how monogamy as a societal norm is also undermining acceptance of bi sexuality. Statements like: Men are allowed to do gay stuf once, to ensure they are not gay (about the stigmatization on male-male-female threesomes) are interesting if one realises that having had a threesome is as common as having a cat, between 10% and 17% of adults (but only 2-3% saying they’d engaged in group sex in the last year). Meanwhile we have some ethical, consensual non-monogamy observations, in a world where according to the author over 1/3 of people (including heterosexuals) having had an open relationship.

Overall this is an interesting topic but I feel more thorough execution could have helped enormously to better understand the topic and have a more human perspective on what being bisexual in the current world means."