If there is a field called sex (a purely biological value), then the sexes are yes, only two are male and female. But if there was a gender field, then, as it is correctly noted, there are variants.
It is...
The Egyptian enters the states, fills out a questionnaire at the entrance, he is asked:
and sex?
5-6 times a day
I mean male, female?
Male, female, sometimes - camel