1. initially safe,sanitized corporate friendly jokes 2. some commercial success 3. ? 4. jokes increasingly become a social commentary and are less and less 'friendly'
I am too lazy to dig it up now, but youtube has multiple interviews that go over that stage of his life.
"I Love Lucy" was the first TV show to say "Pregnant". "Bewitched" filmed Samantha wearing almost see through evening wear but television was such grainy low resolution analog broadcast that the audience was unaware. The remastered DVD's make that more obvious now. There are many other lines that in hind sight seem odd now. Benny Hill crossed a few lines and managed to get nudity allowed on TV when it was otherwise forbidden.
Trying to start his career with The Seven Words You Can Never Say on Television would have clearly been a ... non-starter.
This is just the punchline without the setup.
Try new cheese-tits! Bet you can't eat just one"
R.I.P. George