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This is for Facebook's ad targeting. They want advertisers to be able to advertise to 21-24 year old women in California.

They can probably infer it as accurately as asking people. The inference isn't always accurate, but people don't always tell the truth, either.

They can do both. Someone lying or their inference being wrong about their gender is yet another new data point.

Different sexes have different civic obligations. E.g. Selective Service, a.k.a the draft, in the US.

Sounds like it's ripe for a discrimination lawsuit.

> Sounds like it's ripe for a discrimination lawsuit.

Such a lawsuit has occurred:

https://en.wikipedia.org/wiki/National_Coalition_for_Men_v._...

I can see wanting to know what pronouns someone uses so you can autogenerate reasonable sentences about that person (i.e. "Tomp marked himself safe from the rabid bears in Honolulu")