I take the point about rejecting the men-only dojo concept out of hand without hearing the rationale. I will turn the flame off.
I feel that a women-only dojo would be doing the members a disservice as their attackers outside will be men and they should learn to deal with them on the mat to have a decent chance on the street, no?
Women-only gyms are common but that is different because the women would like to work out without having guys oggling them and the purpose is very different from learning a martial art.
I guess the same-sex dojo would only be illegal if they were receiving public funds?