I?ve played the Wii for over 35 hours so far, most of which with my girlfriend. WE haven?t hit each other yet, so I suppose it?s all a mater of doing it right. I mean logically that you can?t (shouldn?t) play Wii Sports Tennis sitting on the coach next to someone it requires some space, just like when you play any given group sport or activity where motion is involved otherwise you would need a constant medical crew at the gym.