Testosterone Rex

As a basic take-away - there's no such thing as a “male brain” and a “female brain”, while some things show gender differences they are usually small, most people of any or no gender have a mix of traits that may be more likely to occur in a person with either a male or female body such that it's not possible to predict someone's gender or sex based on these traits. It is hard to separate biology and sociology, and people become aware of gendered things and how they are supposed to react to them and internalize that from an extremely young age (I recently saw a talk from [a:Shannon Hale 49177 Shannon Hale https://images.gr-assets.com/authors/1299093233p2/49177.jpg] where she mentioned that school-age boys will either be completely uninterested in reading her Princess Academy books or will be embarrassed to admit that they do - unless they're homeschooled! Which speaks a lot to the socialization of gender expectations). Also, testosterone is more nuanced in humans and animals than you may think, and doesn't necessarily map easily to things that are “masculine” (and in fact testosterone levels sometimes change in response to external stimuli and behaviour instead of a change in testosterone causing changes in behaviour).Basically, this book says that “boys will be boys because biology” is a silly way to approach the world and human behaviour.