Two guys are talking in a bar about their sex life at home. One is just complaining, but the other says "Our sex life has evolved, but it's still very active."  
   
 "Really", says the friend, "how do you keep it fresh?"  
   
 "Well, when we were young and really hot for each other, we would even have kitchen sex and jump on each other in the kitchen."  
   
 "Then, things cooled down, but we would still have great bedroom sex."  
   
 "But now, we've progressed to hallway sex."  
   
 "No kidding, how does that work?"  
   
 "We walk past each other in the hall and go: Fuck you. Fuck you.

I don't claim to have originated that joke, but that's a copy/paste repost.

I apologize, xray84. Thanks for keeping me straight. I'll try to keep it original here