In this day and age, gender roles are quickly disintegrating. It is now very common for women and men to fill traditional gender roles that were solely believed to belong to the opposite gender by previous generations.
This is partially due to economics: families need more money to live the kinds of lives that they feel they deserve. This has resulted in dual-income households. Of course with more children being born out of wedlock and divorces becoming more commonplace men and women both need to work to support the children they make.