Worst...OR BEST?!?!?!SextusMaximus said:The absolute worst place? A nunnery.
My vote is a walk-in freezer. Dunno if anyone here has ever worked with food, but being in one is a profoundly unpleasant experience normally (except for during the summer) and having sex would also be just as bad, but more awkward (except maybe during the summer...hmm...)
Let me try this again as I think I may do the above someday.
On top of a moving train. At a funeral. On fire. In Hell.