When did the meaning of the phrase "make love" change?

Nowadays to "make love" is a clear euphemism for ual . Reading the works of F. Scott Fitzgerald, it is seems that circa the 1920s the phrase was connotative of , flattery, to "hit on" someone. This has left me confused, when I hear the phrase used in any song or movie or literary work from a time period in between now and then, when it was that the meaning of the phrase shifted...