I propose a fightback for clear language. "Unisex" makes no sense. Some words are inherently confusing to the general public, and are best avoided. Flammable/inflammable being synonyms not antonyms, for example - a confusion with potentially lethal results - so sensible powers that be got together to encourage the use of "flammable" and the gradual withering away of "inflammable", on clothing labels and paint tins and aerosols and what have you.
"Uni" means "one". "Unisex toilets" makes no sense, because there is more than one sex. What is the best, clearest term? Mixed sex? All genders? Open to all? Everyone welcome?