By contrast, many women in couples (particularly those with children), are more likely to be second earners than men, and so will see a reduced incentive to work.
I'r gwrthwyneb, mae llawer o fenywod mewn cyplau (yn enwedig y rheini â phlant), yn fwy tebygol o fod yn ail enillwyr na dynion, ac felly bydd ganddynt lai o gymhelliant i weithio.