I think lots of issues are actually internalised, but it's difficult to know how those feelings got there to begin with. Women are basically expected to pick up the slack. Working, but also doing all the housework. And for some reason, this being the normal, default position.
Being the default child care providers. I don't think the law actually helps in this regard. When separated, women are - LEGALLY - expected to fit in around the whims/holiday plans/ of their ex partners, and can be legally punished if they don't. Men aren't held in any way accountable to actually parent on the time that they are given. They have that RIGHT, but none of the responsibility that goes with it. Because the woman can sort out the shitty bits, right? You see it time and time again on here!
The strange thing is how many women seem to accept the dogsbody label and just go along with it. Men aren't brought up to be scared of confrontation, whilst I think women are. It's not good to rock the boat. Being assertive is considered being aggressive, which in turn is not considered very "lady like".
That said, everyone has expectations of behaviour from society. Men, women, children. It's part of how society functions. It isn't necessarily a bad thing.
The difference is that women tend to be condemned for going against those expectations, in a way that men aren't. For example, I don't think society overall considers it a positive character trait if a man sleeps around with loads of people (it used to, and some brain dead idiots might still do, but overall, not). But society wouldn't actively judge him for it, or consider it a huge personality flaw. If a woman sleeps around a lot, society still considers that to be a very big moral failing, and will actively condemn her for it.
Both men and women are expected to make an effort with their appearance, but not TOO much of an effort. No-one wants to sit next to someone who reeks, or wears filthy clothes, etc, but at the same time, a man who truly obsesses over his hair, clothes, etc, will get mocked the same way a woman would. Thing is, men get much more leeway. The standards they are held to are lower, overall. Looks are important, but they aren't all encompassing. People don't bat an eyelid if a man wears the same suit to work everyday with a different shirt, and outside of work lives in one pair of jeans, a selection of t shirts, and trainers. I honestly believe people would find it really, really weird if a woman did the same.
Look at people in the general celebrity public eye for example: Men can just as easily look at role models who got by on humour (Vince Vaughn? Ben Stiller? Jack Black?), or charm (Ryan Gosling?), or force of personality (Vinnie Jones et al?) or hell, let's not the huge range of people who got through on pure talent (Ian McKellan et al). Women don't really have that luxury. They can have the humour, or the talent, but 8/10 they have to have the looks as well.
Men might be expected to bulk up for a specific film role (Like High Jackman in Wolverine or whatever), but they aren't expected to look THAT buff ALL the time. Women are expected to simply look a certain way, constantly.