Rocky has broken his leg and his buddy Bob comes over to see him.
Bob: How are youy doing?
Rocky: Fine. Hey, do me a favor. Go upstairs & get me my slippers. My feet are freezing!
Bob goes upstairs and sees Rocky's hot twin sisters lying on the bed.
Bob: Your brother sent me up to have sex with you girls.
Twins: Oh Really??? Prove it!
Bob (Shouting): Hey Rocky, both of them?
Rocky (Shouting back): Of course! What's the point of fucking one?