That joke’s so old it’s in a Benny Hill song.

She said she’d like to bathe in milk, he said, "All right, sweetheart, "

And when he’d finished work one night he loaded up his cart.

He said, "D’you want it pasturize? 'Cause pasturize is best, "

She says, “Ernie, I’ll be happy if it comes up to my chest.”

https://en.wikipedia.org/wiki/Ernie_(The_Fastest_Milkman_in_the_West)