Thank you! I completely agree. People are so surprised partly because we're so accustomed to see male diagrams in our science textbooks. For some unscientific reason, the "average"/"standard" human is always depicted as male. And this can even translate to actual harm. For example, research shows that female heart attacks are 50% more likely to be misdiagnosed because they present with different symptoms than male heart attacks, but not enough people are educated on this, so the symptoms are missed. Some drugs hit the shelves without being tested for women because the "extra" testing (extra, as in only for half of the population!) costs money. As a result, some of those drugs don't work for women at all, and some work "too much" - the recommended dose ends up higher than what a female needs to take. More fun facts: Another research showed women were 47% more likely to be injured in car crashes because crash-tests only use male dummies. So every car is crash-tested for the safety of a male, but none is tested for the safety of a female (driver or passenger). The female dummy is actually a smaller male dummy, only mandatory in 1 of 5 crash-tests, only since 2012 (in EU) and worse, only tested in the passenger's seat. Isn't that completely, utterly insane? So you're completely right to say we need a wider mix of examples, especially in matters of health.

Actually, you'll find diagrams of the mammary glands in any anatomy textbook. They're in the sections on the ENDOCRINE or INTEGUMENTARY system, where they BELONG. They are not visible on diagrams of the muscular system because they are NOT muscles. It has NOTHING to do with men vs. women.

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I think you might see a bit too much. Men and Women always worked together. Life was very hard, people were busy surviving and society was cruel to both genders. There was a reason why male bodies were shown and females not but this is a very deep topic that goes back a few thousand years. If one doesn't go into the full history and psychology of it one easily is tempted to fall for false conclusions. But yes, getting over it would be very good. About grammar, there are more than enough experts that pointed out that this assumption is wrong, language doesn't favoured male. This was only brought up in the recent years by some political people with no education at all in that field. And there are women specific clothes for centuries, including for example trousers that were open in the crotch so it was easier to pee for women when working on the fields at farms. They were specific to women and existed until about 70 years ago.

This pic is only supposed to show the MUSCLE. Of course there is also fat. Calm down.