A huge guy marries a tiny girl, and at the wedding, one of his
 friends says to him, "How the hell do the two of you have sex?" 
 
 The big guy says, "I just sit there, naked, on a chair, she sits
 on top, and I bob her up and down." 
 
 His friend says, "You know, that don't sound too bad." 
 
 The big guy says, "Well, it's kind of like jerking off, only I got
 somebody to talk to."