Beds acctually face all 4 directions.
Outside cabins alternate with ever other bed facing forward or aft (primary beds only, 2ndary beds are turned so they face the cabin door our outside (just depends where they put the pillow I think).
Inside cabins have the bed against the far wall such that they face the cabin doors.
We usually have outside rooms with verandahs, and we've faced both directions. As others have said, unless you look out the window, you can't tell which way you are going and it hasn't mattered to us.
BTW, the beds face the side of the room where the cabin door is, so if the door is on the forward side of the room, the bed faces forward.