Derivation of the slang phrase "Making-Out"

Factual Questions
1

Just that really,

anyone know where it comes from?

Cheers in advance.

CD

2

It first appears in print in English around 1949-51. No doubt it goes back to WWII.

It is a logical sequence to the phrase -“how did you make out?” You can also throw in describing a woman as an "easy make(1942), "on the make(1929-looking for sexual activity), and many other uses of "make.’