My sister is a teacher and she has always said that if she had a baby, she would go back to work and her husband would stay home to look after the children. This isnt just because my sister earns more, at the moment, my sister doesn't see herself as able to stay at home all day. Mind you, that could well change if she has children.
It all depends on the person - some women love their children to bits but they have to work full time or they couldn't cope, others prefer to work part time and some not at all - its up to what suits the individual and I would never judge anyone for what they choose to do - its their choice.
Xenia - my husband and I started off on nearly the same pay scale - interestingly enough, I earnt more than him in the beginning. As time went on, he's gradually moved up within his role and got a big promotion. I moved up a degree and it seemed to stop there....got to stage where I had to choose between giving my all to the company and majorly kissing arse for the next few years to be considered for a management role (its a sad fact that the people who stay late, agree with all what management say etc are more often than not the ones that get promoted) or trying for a baby.
Funnily enough, a new person started just before I got pregnant and during my pregnancy I trained him on all what I knew....just after I had the baby, he got promoted to a role that they told me wouldn't be available as budget etc....its a sad but true fact - there is a gender gap! He was a kiss arse though so that helped him a lot!!