I not only seperate the sexes, I keep women out of the dojo altogether.
I may have the only dojo in the country that does not accept any women students.
I could go on for hours as to why, but the real reason is that it pleases me. As I turn away anywhere from 5 to 10 potential students a week (the dojo has a waiting list) I seem to be doing something right.
We have no issues with dating, male dominance, PMS, jealosy, locker rooms or toilets. Back when I allowed women to train I NEVER let husbands and wives or couples train together. Over 30 years I've seen too many personal problems brought to the mat. I should mention that my lovely wife is a Shodan. I have no problem women training everywhere else, I think its just fine.