There's a ton of recent articles about this.. here's but one.
http://www.theatlantic.com/national/archive/2010/10/for-the-first-time-the-tsa-meets-resistance/65390/ You get an enhanced patdown if you refuse the full body scanner.
They apparently reach up your thigh until they meet "resistance" i.e. your testicles.
With women, uh...
So stupid.. note to terrorists, refuse the body scan and hide the bomb in your a-hole... they won't find any resistance. Bet they are laughing it up at what has stemmed from their attacks.
A perspective from Israel:
http://www.thestar.com/news/world/article/744199---israelification-high-security-little-bother
They have obviously been dealing with this stuff for decades... so perhaps they may know a thing or two.