When I first heard about it (around 2006-2007, I believe), I don't think it was optional. I think the first article I read about it was before it was first installed in the airport and people were making a big deal about it, which is probably why it ended up being optional. Not sure what ever became of it or if it ended up in other airports. That article I linked to was pretty old. Since Bingowings was mentioned it a few times, I assumed they took root and were being used at least in the UK, but maybe not.

While you may not feel it is a very big deal, it is still providing airport security a image of your naked body, and a lot of people are not going to be comfortable with that. I simply do not think that type of invasion of privacy is necessary. It is taking things way too far.

When technology has advanced to the point where the powers that be can develop machines with the power to tell how much hair is on my back, what sized cock ring I am wearing, and whether or not my girlfriend has implants, I think it is time for some hideous turn of events to knock us back a few years. There are some places technology was simply not meant to go, and we are heading there fast.