I ask this question knowing good and well 98 percent of the people that post here are men (although if you are the rare woman posting here, do you make more than your partner?)
Not to sound obnoxious, but personally I don't mind in the least bit that my gf (that I live with) makes 50 percent more than I do. As far as I'm concerned, the more the merrier. If we end up getting married, which we probably will, that just means we'll be able to buy nicer shit.
Even at this point, I insist on paying 50/50 on the bills, which would further incentivize me to make more myself if I want to spend more money on myself.
So if any of you guys make less, does that bother you? Do you expect them to pay more toward the bills? I'd image the answers to this may vary depending if you are married to the person or not.