That's already happening. At least at the college level.

Name one fascist country that didn't have boys and girls.

Case closed.

I have to admit, it's highly unlikely that many kids reach the age where they'd be reading the definitions without having some idea what the word marriage means.

I can see where a definition might be useful in a college-level anthropology textbook, though. (Do the Nayar have marriage or don't they, that sort of thing.)

I am a sexist. I love sex. I must be a fascist since I discriminate between boys and girls, between men and women, between the linear angularity of the masculine and the encircling curvaceousness of the feminine. I'm a deviated prevert because I prefer the sinuous path of sin to the straight upright rod. I'm a face-ist because I'm most turned on by a woman's face.