Thank goodness - I'm not the only one!!
For a little while during my 2nd Tri I thought it would be fun, cos I was feeling energetic & kind of content with my belly, but BIL sleeping about 10 feet away was a fabulous way to put both of us off the idea. And stupid man never thought to leave the house for a couple of hours on a weekend morning....

Now - the whole concept is just that, a concept. I can't imagine where those who are DTD are getting the energy, although good luck to them I say! I'm probably more worried about whether the urge is going to return afterwards, and even more concerned that watching me in labour & giving birth is going to turn DP off me forever...that would be sad.