I was sent this article on key differences in being out of work for men and women
It's from the USA, and they don't have the same rights over things like maternity leave as we do in the UK (or the rest of Europe), so that may affect some people's decisions. But I think some of it is probably relevant here, like men being less willing to take minimum-wage jobs than women are.
(I'm not sure I agree that sleep counts as leisure.)