I only do incalls but have found greater variety when punting at a hotel, normally have round 2 on the bed but round 1 in all sorts of places, the side board is great fun - did the deed in the window alcove in a hotel on the A14 a while back, also great fun.
Flats tend only to have the bedroom available as others are using the other rooms and private houses only the punting bedroom is an option, other rooms off limits as Missfilan says.