I hate the TSA and everything, but can't you just look at someone and imagine what they look like naked in much higher resolution than the body scanners provide? People are afraid of being naked, but we all pretty much look the same.
as an aside, I have to say I felt pretty uncomfortable seeing a man send my SO through the scanner; we weren't expecting it at our airport and she didn't really know what it was until she was already through. The power dynamic was a big part of this.
I don't like the body scanners, but I could care less if someone sees me naked. The reason we should fight body scanners is because the cost/benefit ratio sucks. It takes too long to move a line of people through these things, so they aren't used on everyone. So all you've done is thwart terrorist groups that only have one member.
There could be no airport security at all and it's unlikely that many more people would die. If we lost one 747 a year, it would be a rounding error compared to the number of people dying in car accidents or from excessive consumption of unhealthy food. So why do we spend any time solving this non-problem? It just doesn't make sense.
For instance, I don't particularly care about being naked in front of people, but when I feel like I'm being objectified/letched on, that makes me uncomfortable, regardless of my state of dress.