I can answer that one. At least, in part.

Before you're married, you're sharing space. It really is the marriage that changes things. Something about that puece of paper assigns gender roles and jobs.

Before we got married, it was an equal/equitable split. Soon as we got married that language crept in. I was gonna be late getting home one day and called my husband to let him know and that I would get myself something to eat. The implicatiln being that he too, was on his own for dinner. I reminded him there were leftovers in the fridge He asked me if I needed him to help me make his dinner when I got home so he wouldn't have to wait even longer because he doesn't like leftovers. And he had a car. And this was the 90s, so things were much better economically; we could easily afford it. And we were living in the same city as his parents, where he could have gone visit for dinner.

But no. Suddenly he's a manbaby that can no longer function as an adult on his own. But he was fine before that piece of paper.