Who is Welcome to the Monkey House: Foxy Grandpa from Welcome to the Monkey House and what is their importance?

Billy the Poet disguises himself as someone the Hostesses refer to as a Foxy Grandpa, an old man who comes into the Suicide Parlor as a volunteer, who socializes with his Hostess for hours before requesting to be put to sleep. The Hostess must wait with the Foxy Grandpa until he requests the needle. This particular Foxy Grandpa (Billy the Poet) is helped by Nancy. While he decides on a final meal, he tells Nancy the story of how J. Edgar Nation developed and promoted ethical birth control. He eventually reveals himself to Nancy by removing his rubber old man mask.