Janet Street Porter, of all people, did make me question myself recently though. Her point was that in Supermarkets, store room staff get paid more than till workers. Store room staff tend to be male and till workers female. Both are unskilled jobs. Is that fair?
I'm not sure but at the end of the day I figured it's the market that decides the rate, not prejudice. And of course, there's nothing to stop a woman working in the store room or a man on the till, should it suit him.
Personally I'd take the store room job, whether it was better paid or not.