Good overview of the literature.
Recently I saw a videoseries by the vlogger "FaceandLMS", who stressed that facial attractiveness is both important to men and women. Now, you might say "duh", but it's a lot more sophisticated than that. For one thing, PUAs all stress that women's attractiveness to men can be worked on with "game", a whole series of sly behaviours and mannerisms; same with all the experts and magazines and whatnot. MGTOWs and incels (involuntary celibate young men), however, argue that PUA/game is all marketing bullshit -- at best overrated, at worst a scam. Personally, I don't see why game is necessarily nonsense or bad; it's good for young men to learn what women like and don't like. OTOH, most of these PUAs are definitely sleazeballs who will literally say anything to both men and women in order to exploit them, respectively for cash and sex.
This book definitely supports the MGTOW/incel side of the story. Besides tallness, male facial attractiveness is a huge plus in dating. A guy who has a masculine, "average" (i.e. without deviations from the ideal) face, and conforming to the 1.618 "golden ratio" will have a huge advantage over his peers, according to many research and tests. If you deviate from these norms, you will be disadvantaged. So, having a great personality and a sense of humor are great assets, as all these magazine claim, but they're secondary to being attractive. This isn't just a Western thing either, all women of all nations and cultures respond similarly. All of these things hold for men as well, but everyone already knew that men are mostly attracted to physical appearance.
The last third of the book isn't so much about facial attractiveness, but more about attraction in general. The author seems to want to sugar down some of the implications of the harsh truths he's saying. Suddenly, he mentions that being nice and reliable are important to women for long-term relationships. Everyone who has had a friend for more than 2 months knows that, yes, you need to be need to be nice and reliable in order to keep them -- so, yes, you also need to be nice and reliable in order to have a happy long-term relationship. But that wasn't the issue.
I mailed the author with the question if there had ever been done a worldwide investigation into facial attractiveness. It's remarkably easy to do. Just fit the golden ratio mask on various groups of people and see how strong the correlation is to the mask. Perrett responded that this would be difficult, because, for example, Asians like "rounder" faces more so than Westerners do. However, it's a valid question to ask in my opinion. In all these top 10 lists of countries with the "most beautiful people" you always see Venezuela, Ukraine, Sweden and Russia ending up on top. So, there might be some truth in it? The whole point of the book is to argue that beauty is objective and measurable.
Anyway, it's a fun, well-written, to-the-point (excepting third part) book. I recommend it.
NB I'm not advocating PUA/MGTOW/Incel or whatever else these guys call themselves. They're, as far as I know the only ones talking about these things.