Words related to fore-
"Opportunity has hair in front, behind she is bald; if you seize her by the forelock, you may hold her; but, if she once escapes, not Jupiter himself can catch her again." ["Dictionary of Latin Quotations, Proverbs, Maxims and Mottos," H.T. Riley, London, 1866]
early 13c., "a leader," from fore- + man (n.). From 1530s as "principal juror;" 1570s in the sense of "principal workman." Similar formation in Dutch voorman, German Vormann, Danish formand. Also in 17c., a slang word for "penis." Fem. form forewoman is from 1709, originally of a jury; forelady is from 1867 in reference to juries, 1888 of shops, American English.
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]