Agreed.

Their bone structure is different, and it's determined several months before birth (although this is not evident in the crouching position in utero). Even at birth, boys and girls can be told apart without looking at their genitalia. Only that in modern society we have made ignorant and unaware of differences, and people need to see genitalia, or cultural clues in dress and hair. This is how and why heterics think we pedos like both boys and girls [*] - because they can't tell them apart and they think body hair and muscle (in boys) or boobs (in girls) are necessary to tell apart genders. I guess they've never seen a Turkish weightlifter girl; or a Thai ladyboy with implants. Or maybe they did, and they don't know yet that they were fooled.

[*] Of course, some pedophiles like both boys and girls, but it's very far from being all of us; and the terms in which they like both are like the terms in which teleio bisexuals like men and women, that is, as different attractions, not as "I can't tell them apart anyway"