Seriously, I don't see what the big deal is anyways. The only concern I have with the machines is the dose of radiation (not a huge deal for your sporadic traveler, but if you're a frequent flier or a flight attendant, I can see how it would add up) and subjecting children and the infirm/elderly to it.

But really, who cares if some dude in the back room sees an outline of your junk.