This is quote is referring to men and women and the acceptance of gender norms. Men are the keys and women are the locks, obviously. I think it is so weird that in so many years nothing has changed. If one man sleeps with many women he is looked at as a hero, this is simply not the case for women. A woman who sleeps with many men is seen as a slut. This was the same in the Renaissance times. Women were expected to be virgins when they got married while men had no expectations at all. Why have double standards survived for so long? The fact that in the 21st century women are still expected to be virtuous and men still have no shame.