[Dr. Sivana]

Well, in the 40's "making love," meant flirting, now it means something else. (Do you remember in It's a Wonderful Life, when Donna Reed says, "Mary: He's making violent love to me, mother!")

Also used in "North by Northwest", and long before the train goes into the tunnel.

[Theo]

I initially thought the line in NxNW was the innocent “older” understanding of the term. But after re-watching, it seems pretty clear that Cary Grant’s character is meaning the modern understanding ...