Green’s Dictionary of Slang

premises n.

the vagina.

1683		XV Comforts of Marriage 81: As soon as he entered the Premises.... she must fall into a fainting shriek.
1703		N. Ward Madam Coming-Sir 364: Like a true good Humour’d Prostitute, who, at the Expence of a Bottle Resigns her Ultimate [she] will open the Secret, and give you leave to enter the Premises without any further Hesitation or Delay.
1705		Wandering Spy XV 8–15 Sept. 60: I beseech you, Madam, grant me but a Nuncupative Will, and I will Administer now in your Life-Time, and take peaceable Possession of your premisses.
1786		C. Morris ‘The Great Plenipotentiary’ Collection of Songs (1788) 46: Each Sluice-cunted Bawd, who’d been shagged abroad, / Till her Premises gaped like a Grave, Sir.
1890–1904		Farmer & Henley Sl. and Its Analogues.
1904		Lustful Memoirs of a Young and Passionated Girl 62: I placed myself on my back expecting him to mount me at once but he wished to examine the premises first.