Willy,
That's not my experience at all, there were always a good mix of both women and men in all the net cafes I've known and used in China. ...Perhaps it's something to do with the time of day/night that might be a factor, i don't know because i never really took that much notice to be honest. Most of the net cafes i have used there, were very well run, and some very ,very sophisticated, in both equipment and facilites, including dedicated webcam booths.
David.....