Film The Piano Teacher had a scene of bathroom sex involving Isabelle Huppert and Benot Magimel. Kerner recommends adding a little flavor with food, but skip cliched (and messy) chocolate sauce and whipped cream in favor of Red Hots.
You can also lie back, put your feet on his shoulders, and lift your bum up to meet his thrusts, which allows for particularly deep penetration. Therefore, every touch during this time becomes a lot more intimate. Likewise, ottomans don't get as much action as they deserve.