For the 30th anniversary of Cheers, GQ interviewed some of the former cast members and Kirstie Alley who never disappoints with her remarks, had this to say about Ted Danson being hung:
5. Ted Danson has a nice schlong.
Alley: There were bathrooms where you’d take showers before the show. So the big game became getting the door open, so that you could take pictures of nude people. I have the greatest picture of Ted. That was a big caper: There was one person [opening] the door with a butter knife and another person kicking the door in so I could get a photo. He’s decapitated, but totally nude. And he’s really well-endowed.
via Ted Danson is Well-Endowed: Life-Changing Revelations from GQ’s Excellent Oral History of Cheers.