Good post nooka.
Of course these things should be seen as a family issue rather than male/female.
When a couple have children, the decision about work and childcare is a joint responsibility. Childcare costs shuold be viewed as a joint expense - they enable the parents to work. No different from paying the mortgage or food bill.
For a period of time, our childcare costs were effectively the equivalent of one income - but I didn't view it as me spending all my income on childcare. It was a joint expense.
I also think Quattro makes an important point - many women choose to take lengthy periods of time out of the workplace, or return to work 2 or 3 days a week, which is fine, but there is no point in then comparing your career progression with someone who remains full time. It is perfectly possible to take even the maximum maternity leave of a year, and then return to full time work - you could even do this two or three times to complete your family, and it wouldn't necessarily mean loads of time out of the workplace in the greater scheme of things.
But the fact is that a lot of women choose not to return to senior positions or full time work, or they don't actively seek those positions.
Of course, this is a separate issue from where one gender is paid a lower rate for the same or equivalent work, and that's wrong, and has actually worked against men as well as women - there was a recent case in the media where men went to tribunal over being paid less than their female equivalents.
But I think we need to separate the two issues. Men and women should be paid the same rate for the same job. But it's no good women playing the sexism card if they have made an active choice to work less, or in less senior positions.