What don't men understand about women?

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I've made another question called, What don't women understand about men?, so nobody can accuse me of being sexist.

I was sat by some girls and one took out a makeup bag and her eyelash curlers out of it so they could share it. She asked me if I wanted to use it as a joke. I told her that my eyelashes are naturally curly. She looked at me and told me If you was a girl you would be lucky.
Every group of girls knows when each other's periods are. But for some strange reason, around men, they can't talk about it. They even have a code word for period and it's called bellyache. If a girl asks her friend to go and get something, she'll say she's got a bellyache. Why?
The constant pressure from birth from society that forces girls to be aware of their looks and that they have to look good in life.
Why girls who want a relationship sometimes don't know what they want.

society

understand