[Reno89519]

All sports, school or otherwise, that have legit reasons to separate gender should use a person's birth or DNA or whatever one wants to call it gender. That they are confused and want to declare themselves differently, that is their choice but doesn't change the gender they were born with.

Otherwise, have male, female, and it.

[Dilbert San Diego]

And it offends the sensibilities of the activist types to say, which chromosomes or genitals does a person have, to determine the sex of an individual.

Something which used to straightforward has become difficult to deal with because so many are kowtowing to these activists and their demands.

[Tax-chick]

a person's birth or DNA or whatever one wants to call it gender

Sex. The word for the quality you are trying to describe is "sex." My sex is female. My gender is utterly irrelevant to my performance as a runner, but my sex is relevant.