THE ANSWER?

From the NY Daily News:

“Mad Men” star Jon Hamm’s private parts are causing a stir. Again.

An AMC insider tells Confidenti@l that during filming of the sixth season of the hit show — when the ’60s-style clothing was a tight fit — Hamm was politely instructed by a staffer at the network to please wear underwear while shooting his scenes.

“This season takes place in the 1960s, where the pants are very tight and leave little to the imagination,” a source tells us. “Jon’s impressive anatomy is so distracting that they politely insisted on underwear.”

Our insider says that during seasons one and two, AMC’s marketing team even had to do some Photoshop magic on promotional booklets that went out to press in order to make his privates more, well, private.