I'm a big fan of christening every room and sturdy piece of furniture. Unless it's a notel then I'm not touching anything but the sheets preferably, I'd hate to see a black light shone on those rooms!
I love office sex especially though, gives morning meetings in the conference room a whole new fun factor knowing what you've done on it! Plus the chance of being caught "in flagrante delicto" can add a little thrill.