I wonder how some publishers decide which excerpt to provide to the reader. With romance, it's often a heated moment, right when the characters are about to tumble into temptation... (And of course the excerpt ends before there's any fulfillment.)
I always use the beginning of the story. The first paragraph is often the hook that inspired me to write the story in the first place, and it's an old rule among editors that the first page is the only chance to grab the reader's attention. If it isn't interesting, no one's going to keep reading long enough to get to the juicy parts.
When the excerpt is a juicy part from the middle, I usually lack the context that would make me care about the characters. Sure, it may be hot and I can get drawn in purely on the basis of well-written sexual tension, but just as often I don't see anything unique that I couldn't get from any other book.

