"Students often say that before they took this course, they had no idea biological sex characteristics could be so diverse, despite having taken several biology courses."

Shocked to read this, though I suppose it explains a lot. It can be convenient in some situations to use crude categories as a shorthand, but only if those engaging with them do not lose sight of the actual variability & complexity.

What the hell is going on in the earlier stages of education though? This is far from obscure or novel information.