Etymology of a pick up line

Robert Sterling's character in "The Alfred Hitchcock Hour" 1962 episode "House Guest"

used the same pick line Robert Benchley's character did on Ginger Rogers' character in the 1942 film "The Major and the Minor": "Why don't you slip out of those wet clothes and into a dry martini?":

FYI, the song "Isn't It Romantic" is playing on the radio in the background of the above scene:

and this blog post is morphing into the "Family Guy" episode "The Splendid Source" where the cast tries to find the origins of all the dirty jokes in the world.