`
No.

In the sentence, "Everyone must remain in his seat during intermission.", the word "his" is grammatically neutral and means persons of both sexes.

AnonymousIn the sentence, "Everyone must remain in his seat during intermission.", the word "his" is grammatically gender neutral and means persons of both sexes. I don't think so. 'their' is gender neutral.

Anonymous can we use his for female?

You have touched on a politically charged issue in English grammar. Time was, the sentence "Every student must remain in his seat", meaning both the boys and the girls, would cause no fuss. In the absence of a true singular gender-neutral pronoun, the masculine form was used. That "his" can be used half for female, anyway (

I for one use generic his/him/he all the time.

Some of us like to be more considerate of the fairer ***.