I've heard accounts of that type of sexism before in Japan. From what I recall hearing many programming shops are all female because the market as a whole is sexist enough that they can get away with paying women lower wages. I have neither cite-able sources nor first hand experience admittedly so feel free to take it with a grain of salt.
My son was in Japan a few years back, and said that there was a 'help wanted' publication for the city he was in. It was released in two volumes, one for men, one for women. I seem to remember he said they were blue and pink, but that might be something my mind added after the fact.