Asuka's the one cooking dinner instead of Shinji? With her competitive and fiery personality, I can't quite imagine her agreeing to settle into the role of a simple housewife.
@meow_pao: They probably take turns, and with Asuka's prideful nature, she probably does it willingly because -- as their evidently healthy marriage implies they went through tons of character development off-screen -- she has grown to HATE the idea of being a woman who shoves every domestic upon her husband. Plus, she wants to prove that she can actually do anything that a housewife can.