I think the point about workplace expectations is very true for us - DH works full time (although earns less than me) and I work part time - he didn't want to reduce his hours whereas I did, although I know it is unusual for the higher earner to drop their hours, but it works for us.
When one of the kids is off sick we generally take it in turns to stay at home with them, unless one of us has something we can't miss at work on 'our' turn.
Difference is, he is always asked 'why can't your DW do it' when he gets the time off (unpaid or using annual leave) and I am always met with surprise when I tell my work he is at home with a sick child as apparently 'they need their mum' and asked whether I feel bad not being there. His boss is a man, mine a woman.
He has never been asked who is looking after his children when he is at work.
He has never been asked how he manages to juggle looking working full time with being a daddy.
He has never been told he is 'brave' going back to work when he has a little baby at home.
He has never had people tell him that he must feel guilty working when he has a family.
I have had all of the above comments, many times - ALL from women.
Good job I married a decent human being who isn't a sexist - he gets very cross at the above and in fact recently put in a request for flexible working to ensure he didn't have to extend his working day when the office increased the opening hours, as he wouldn't be able to do the childcare run if he did. He got it in the end, but they were gobsmacked a man had asked in the first place and took ages working out whether they could agree it or not. Mainly due to the fact they kept coming back to check, again, that I really couldn't do it and it really was him that had to as I don't think they believed him (my hours don't fit with childcare very well).