What does TCB stand for?
My best place has to be in a hot, dusty old attic. I was living in a house with 5 other people, and two of us started seeing each other. We were hiding our relationship so that it's wouldn't weird others out, plus it made for hotter sex. (Of course, they all eventually found out.) We hadn't really been in the attic much, and I was pretty amazed how disgusting it was. REALLY thick layers of dust. We just stood up, her in front of me, and I leaned my hand against a pole, which was the only part of either of our bodies (besides our feet) that touched anything in that attic. It was totally hot, and then we snuck into the shower together.
Some of the best sex I've ever had.
P.S. "Dat be in the butt, Bob" is a common urban legend, but it happens to be true:
http://www.snopes.com/radiotv/tv/newlywed.htm
(Spree: UL site with a few objectionable links, but mostly fine)