foreplay
n.
by 1921 in sexual sense, from fore- + play, n.; Freud's Vorlust was translated earlier as fore-pleasure (Brill, 1910). A more direct translation from the German would be thwarted by the sense drift in English lust, n.. Earlier as a theatrical term:
In fact the poem which Mr. Brooks has translated is but the "prologue to the swelling theme," the fore-play to the actual drama of Faust. ["The Christian Examiner and Religious Miscellany," Jan.-May 1857]