Again this feels like a discussion about middle class peoples lives, which involve au pairs and driving around the town to different activities!
There are plenty of fathers who work around kids. Taxi drivers, bus drivers, security guards, retail workers, cleaners, those who work shift work often take on caring responsibilities on the days/hours they are at home! This is quite normal. My husband has his hours altered so that he can drop dd1 to school before going to work, and so he can be back home on the days I need his help with taking kids to extra curricular activites. Even though I am a SAHM, he still helps.
This is the same for most women I know. A friend of mine sometimes sells food at events on the weekend, her husband enables this by looking after the children.
I disagree with Stealth, I think for as many people who expect you to stay at home, there are just as many who expect you to go to work!
and as for blusocks, because you are not in paid employment, doesn't mean your children don't see you doing worthwhile things. I do not feel validation for my actions according to the economic recompense I receive. I know I do a lot of worthwhile work that I wouldn't be able to do otherwise.
I agree with morethan there are other ways of contributing to society.
blueshoes I organise and am involved in a lot of community and voluntary work. Things like MSLC, DV support etc. The fact is if the women didnt see me around every day they wouldn't trust me. Being a SAHM has enabled me to help people in my community.