Not all domestic responsibilities can shared equally such as having babies.
What it means is that women make choices that make a lot of sense for them.
For example, the choice of occupations that women tend to not to go into, occupations in which there's a very high rate of obsolescence.
If you are a computer engineer and you take 5 years out to have a child and have a child up to the age where you put him in a daycare.
Well, my god, the world has changed. You have to start way, way back.
On the other hand if you become a librarian, school teacher or other occupations like that, then you can take your 5 years off, come back and picku up pretty muche where you left off.