The underwear bombers Christmas Day attack has prompted calls for the increased use of full-body scanners at airports.

So to protest, members of the Pirate Party in Germany organized a fleshmob of people who stripped down to their skivvies last Sunday and converged on the Berlin-Tegal airport.

The protesters marked their bodies with a number of messages such as, Something to hide? and Be a good citizen — drop your pants.

One woman has the word diaper scrawled on her lower back with an arrow pointing to her underwear and the word prosthetic printed on her leg. The word piercing and an arrow point to one of her breasts.

The full-body scanners use high-frequency radio waves to produce an image of a passengers naked body beneath clothes. Anything a passenger is carrying against the body — weapons, drugs or explosives — would be exposed. The scanners would also reveal the presence of prosthetic devices and breast implants.

As such, there have been privacy and legal concerns raised about the invasive equipment, particularly because its unclear if the scanners would be able to detect explosives hidden in body cavities and would therefore likely provide only minimal security.