On the lawn

A man was walking one day, when he came to this big house in a nice neighborhood. Suddenly he realized there was a nude couple making love out on the lawn. Then he noticed another couple over behind a tree. Then another couple behind some bushes by the house. He walked up to the door of the house and knocked. A well-dressed woman answered the door and the man asked what kind of a place this was. ''This is a brothel,'' replied the madam. ''Well, what's all this out on the lawn?'' queried the man. ''Oh, we're having a yard sale today.''