Milton Berle?

Sorry Sorcerer, the King Cock of the West Coast was Forrest Tucker.
Milton Berle was King Cock of the East Coast.

At a Hollywood private club both actors were coincidentally there, and members began placing bets on who had the largest cock.

Berle said: "No, I've been through this before. We're all men here. This is silly."

Jackie Gleason replied, "Oh come on Milton, just pull out enough to win."

I've read that Berle and Tucker belonged to a club that required members to have members at least 10" long.
 
One evening at an afterparty for the L.A. opening of a Broadway hit at the Pantages in 1993, I saw Uncle Miltie head for the john and I hurriedly followed him in, hoping to sidle up to him at the adjacent urinal. Damed if it wasn't a HANDICAPPED restroom, with just a single, plain old toilet with handrails around it. He looked back over his shoulder at me like "WTF are you doing in here?" I sheepishly retreated. Result: Inconclusive
 
Both Milton Berle and Forrest Tucker were legendary for their huge endowments!

I recall reading a book, years ago, that made mention of another very well-hung man in Hollywood, back in the 40's and 50's, by the name of Frankie Frank? Anyway, as I recall, he would be present at Hollywood dinner parties, carrying a large salad bowl with his XXXLarge endowment shoved through a hole in the bowl, offering up some of his salad "con carne" to those not yet "in" on the joke.