The cockerel's splendid red cockscomb is thought to play a part in determining gender and breed.

You should not discriminate against people because of their sex.

One's view is determined by his education, sex, class and age.

Don't discriminate against people based on nationality, gender, or occupation.

Wouldn't it be great if a gender-neutral pronoun for "he" or "she" existed in English?

Discrimination on the basis of gender is prohibited.