Master key

A woman asks: If I sleep with 3 men, everyone calls me a slut.
But when a man sleeps with 10 girls, everyone calls him a real man. How come?

A man replies: It’s very simple. Confucius say ‘When one lock can be opened by 3 different keys, it’s a bad lock. But when one key can open 10 different locks, we call it a master key!’.