The board I was on ended up 50% female which is very very rare but even there I am not sure appointments were just on merit but nebulous other reasons.
I don't drink, have lots of sleep and prefer to come home to bed than socialise with people. I know that that of course has an impact and that does not matter as working for myself earns much more than many part time board posts pay so I do not see it as a problem. However there certainly is a need to be like others to be considered in the frame in some sectors (by no means all).
If you hate sport and don't drink those are other reasons that can have an impact.
As for what Sanjeev says I would hope most of us want the children to respect the teacher. I am terribly lucky where I live that our private (and state) schools are populated by children from cultures where respect for teachers remains high (and I suppose in class terms too perhaps there is more respect for teachers in private schools, traditional values etc).
The biggest issue is that women have pin money jobs and marry men who earn more. If women tended to marry men who earned half what they do because they wanted a fit man 8 years younger who works out a lot and looks good but is never expected to earn much you can bet your bottom dollar it would be the man not woman in those couples giving up work when babies came around.