She sat next to me, her husband across from me.  I was taking a short break from a long bike ride.  Without a preamble she said, "Have you ever buried your cock in a woman while her husband fucked you in the ass?" 

I replied, "Have you ever had a cock in your ass while your husband sucked cum from your pussy?" 

The two of them looked surprised, then I said, "I guess we both have things on our bucket list."  Then I got on my bike and continued on, leaving the two of them in stunned silence.