This is a well-written book on an interesting topic that becomes especially compelling when the author narrates his direct personal experiences, but this makes it all the more disappointing when you realize how it's not as well-documented as it should be, and that politically, in my opinion, it also ends up falling short.
Firstly, the book is very cis-male centric, which we could forgive the author for (he's, after all, interested in his own experiences with cruising first and foremost), but it does make the book devoid of any gender diversity. Lesbians cruise too! And so do trans people, regardless of their gender. Cruising is a queer way of approaching sex, not an exclusively cis-male-gay practice.
At times I'm even hesitant to attribute this... let's say... overlook of anyone other than cis men to simply focusing on his own experiences, because Espinoza almost seems to agree with the point one of his interviewees makes that people with a penis have a "biological urge" to "spread their seed", even mentioning said "biological imperative" later on, which is of course bioessentialist nonsense. Sex feels good for a lot of people, and some people are uninterested in sex, regardless of their equipment. Cruising is a practice born out of rejecting (or out of being rejected by) cis-straight-normativity, not out of cis men being too horny.
Regarding the history of cruising this book claims to recount, it would be easier to forgive the little inaccuracies or places the author chooses to not go into the nuances of how sexuality was understood through the ages if this wasn't quite literally titled "An Intimate History of a Radical Pastime". It is especially surprising that this book chooses to not dwell into the fact that sexuality was not identitarian until very, very recently. It's not just that "people wouldn't call themselves gay" in, say, the Florence the author mentions, it's that sexuality was understood through practices, not identities, meaning anyone could "cruise", anyone was thought of as capable of sodomy, it was a temptation the virtuous sought to resist (good job at making it sound unpleasant, Catholic Church). This would be an extremely interesting nuance to go into for a book about the history of cruising.
However, this book seems sometimes more centered in STORIES around cruising than in the HISTORY of it. It's not that there's anything necessarily wrong with it, it's just that the book seems to sell itself as something it isn't.
There's also the issue of Espinonza's political lenses. We all have our own, of course, but it was impossible for me to ignore how he does little things like mentioning when the USSR outlawed homosexuality somehow avoiding to mention that it was, therefore, legal until the Stalin period. Or conflating communism to homophobia despite the examples of socialist regimes and thinkers who are/were anything but. I have nothing against discussing and deeply criticizing the queerphobia of a big portion of the communist movement (it's one of my favorite subjects to read about!) but there is some clear bias in place when the USSR outlawing homosexuality for a number of decades grants the author allowance to conflate communism with homophobia, but the same cannot be said of the many, many capitalist countries that did, and do, forbid homosexuality. Some of which are discussed in this very book.
Something very similar happens with the brief mentions of Islam in the book. The author will casually mention a political leader or a region is Muslim as a way of explaining their homophobia, but when it's Christianity that drives the same bigotry, he always adds "conservative" before the religion. It's "conservative Christianity" that's homophobic, not Christianity as a whole, whereas Islam and Muslims are viewed as homophobic by default.
Finally, there's the discussion (or, mostly, lack of thereof) as cruising as a radical and/or revolutionary act. I don't even disagree with the author here, I think cruising IS a radical act insomuch as it challenges mainstream morality and legality. I just would have liked a deeper discussion for it instead of the looser thoughts the book offers. Same goes for "revolutionary". How are we defining that word? Revolution against who? Revolution how? In the last chapter there are some thoughts about cruising as creating a cohesive community and shared identity, which again, I don't disagree with, but it just seemed like the beginning notes of an essay, not fully formed philosophical argument in a finished book.