The word "sex" was considered too obscene in formal documents and made retards confused because the double meaning of the word "sex" also being used for coitus.
A form might have
>Sex: (M) (F)>circle onemeaning the document is asking whether you're male or female. Retards would extrapolate whether you like to have sex with male or females and circle the wrong one.
So the term was switched to
>Gender: (M) (F)>circle oneto make it less ambiguous or obscene.
as
>>11503204 stated, gender is also a language thing in many languages. An easy english example is something like God vs Goddess, Prince vs Princess, Actor vs Actress, Waiter vs Waitress, his vs hers, but it often gets more complicated in other languages which have gender modifiers for simple worlds like "the", like in german "der, die, das".
Theres only male and female, apparently hermaphrodites exist but its not common, and mentally challenged english speakers desperately try to push trannyism and genderfluidity and other gay shit.
Not just 10 years ago these nuts were just called "traps". Because you go in thinking you're checking out some chick but theres a tranny penis surpise and haha made you gay.
really though. Men and women. Thats it.