Ah, the Internet. Once heralded as a new "information superhighway", the online world can sometimes resemble more of a wild west of memes and disinformation than the shining frontier of enlightenment we were promised. And despite millions of terabytes of collected human knowledge being literally just a click away, people are still confused about some pretty basic things.

OK, specifically, men are confused.

Last week, Twitter user @wahweepop posted a 76-character description of her date. It's fair to assume it didn't go well.

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Listen, not every person can know everything, but adult humans of any gender should probably have learned at some point that a period typically lasts for two to seven days each month – any longer than that and you should think about seeing your doctor.

But the tweet started a wave of women offering their own stories of times they've been lucky enough to have their own anatomy explained to them. And, dudes, you really need to pick up a biology textbook.

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But don't worry – periods aren't the only thing men don't understand. The pubic area generally seemed to cause some confusion...

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... as well as some astonishing fertility-related mix-ups.

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And if you thought it was only female-specific physiology that's such a mystery, well...

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In fact, it turns out some guys aren't even too sure about their own anatomy.

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Although his views on breastfeeding actually make the whole thing sound a bit more appealing.

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But wait, it gets worse. much worse.