A guy stops by to visit his friend. They talk for a while and then the friend asks, "My feet are cold. Would you be so kind as to go upstairs and get me my sneakers please?"
The guest obliges and goes upstairs. There he sees his friend's daughters, both very good looking. Being the adventurous and quick thinking kind, he says: "Hi, ladies! Your daddy sent me here to have sex with you."
They stare at him and say, "That can't be!" He replies, "OK, let's check!" He shouts at his friend down the stairs, "Both of them?"
The father shouts back, "Yes, both of them!"