It drives me crazy when a guy fucks me bareback - and in front of a mirror.  I lean over in front of him, and watch his face as he concentrates on getting it in my ass.  Then I watch the expression on his face when he slides it all the way in.  And I keep watching my face as I'm geting pounded.  And the best is when he says he's going to cum, and I see the sheer pleasure on his face as he pushes it all the way inside me - and cuns.  Mirrors are the best.