But you CAN sail downwind in reality! It's called backwinding. Basically the same as going downwind, only your bow follows your stern instead of the other way around.
What is with all you whimps complaining about PRESSING A BUTTON?!?!?!?! its not even clicking rapidly, its just holding it! if your muscles are really that weak and your bones are that frail, you need to get off your butt and work out.