What is the most effective definition of gender?

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Biological

>>8018369
Legal documentation.

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A spectrum

Its simple, really
>Have a dick, you're a guy
>Have a vagina, you're a girl

If you change from a dick to a vagina or vice versa, you have changed your gender.

>>8018666
FTMs can get a dick as well as a vagina.

>>8018781
Hermaphrodite.

>>8018369
>What is the most effective definition of gender?

It has nothing to do with what sex you are.

>>8018369
Gender is the range of characteristics pertaining to, and differentiating between, masculinity and femininity. Depending on the context, these characteristics may include biological sex (i.e. the state of being male, female or an intersex variation which may complicate sex assignment), sex-based social structures (including gender roles and other social roles), or gender identity.