Green’s Dictionary of Slang

to copulate; thus at clicket, having intercourse; clicketing copulation; clicket (gate), n., the vagina.

c.1499		Skelton Bowge of Courte line 369: ‘What, reuell route!’ quod he, and gan to rayle How ofte he hadde hit Ienet on the tayle. Of Felyce fetewse and liytell prety Cate, How ofte he knocked at her klycked [sic] gate.
1573		T. Tusser Five Hundred Pointes of Good Husbandrie (1878) 169: Let fizgig be taught to shut doore after taile, Too easie the wicket, Will still appease clicket. [...] With hir that wil clicket, make daunger to cope, least quickly hir wicket seeme easie to ope.
1619		Fletcher Humorous Lieutenant II iv: Away with your whore [...] must ye be clicketing?
1629		Massinger Picture III iv: Cannot you clicket Without a fee?
1632		Jonson Magnetic Lady IV iv: Had I the keeping of your daughters clicket in charge?
1648		Mercurius Melancholicus 34 17–24 Apr. 201: [He] went a clicketting with a holy Sister to exercize their gifts [at an inn].
1654		Mercurius Fumigosus 28 6–13 Dec. 236: Her Husband plaid at Clicketts with a merry Wagg-tayle of the Town.
1668		J. Wilkins Essay 234: lust Salacity, Venery, Concupiscence, libidinous, carnal, fleshly, blissom, clicket.
1687		Etherege Letters 167: Poor lovers like Hares in releifing time are fain to clicket up and down in the Gardins at Midnight.
c.1698		B.E. Dict. Canting Crew.
1725		New Canting Dict. n.p.: The Cull and the Mort are at Clicket in the Dyke. [Ibid.] clicketting, The Act of Fruition; as, He has pick’d up the Blowse, and they are pik’d into that Smuggling-Ken a Clicketting.
1737, 1759, 1760, 1776		Bailey Universal Etym. Eng. Dict. [as cit. 1725].
1785, 1788, 1796		Grose Classical Dict. of the Vulgar Tongue n.p.: Clicket, copulation of foxes, and thence used in a canting sense, for that of men and women; as, the cull and the mort are at clicket in the dyke; the man and woman are copulating in the ditch.
1811		Lex. Balatronicum.
1823		Egan Grose’s Classical Dict. of the Vulgar Tongue.
1896		Farmer Vocabula Amatoria (1966) 254: Toucher. to copulate; ‘to clicket’.