Green’s Dictionary of Slang

of a woman, to behave promiscuously; thus cloven adj.

1641		R. Brome Jovial Crew Act III: Unlesse you, Mistris, will affirm that you are with Child by the Gentleman; or that you have, at least, cleft or slept together (as he calls it) he will not marry you.
1660		Wandring Whore II 12: Let all such as fear not the losing of their Eye-sight, come put in their nose, as Chaucers twelve Fryers did at the dividing of a fart amongst them, and they may have it of a sluttish wench at the sign of, Have you got any wood to cleave, &c.
c.1684		‘Westminster Frolick’ in Pepys Ballads (1987) IV 131: You thought your Maid was in your arms when you so closely cleav’d.
1725		New Canting Dict.
1785		Grose Classical Dict. of the Vulgar Tongue n.p.: Cleave, one that will cleave, used of a forward or wanton woman.