Green’s Dictionary of Slang

1. the vagina; cit. 2000 refers to the hymen or fig. virginity [a relatively rare positive image, also see treasure of love under treasure n.¹ ].

1593		Nashe Choise of Valentines (1899) 16: Hould wyde thy lapp, my louelie Danae, And entretaine [sic] this golden showre so free, That trikling falles into thy treasurie.
1608		Middleton Mad World (1640) III i: Fooles then are maides to locke from men that treasure, Which death will plucke, and never yeeld ’em pleasure.
1675		C. Cotton Scoffer Scoff’d (1765) 261: I’ll be so civil and so wise [...] To turn my back [...] And whilst your treasure you display / Turn my Calves-head another way.
1688		‘Advice to the Maidens of London’ in Ebsworth Bagford Ballads (1878) II 935: Nancy and Nell, of the Billings-gate Crew, / they’l Mortgage their secret Treasure.
1700		‘Kate’s Beauty’ in Playford Pills to Purge Melancholy II 244: Her Belly’s a Hill of sweet Pleasure, / In Bush enclos’d lies the Treasure.
1719		in D’Urfey Pills to Purge Melancholy IV 66: Her Belly’s a Hill of Sweet Pleasure, In Bush enclos’d lies the Treasure.
1738		Man-Midwife Unmasqu’d 3: The Doctor then answer’d [...] Then start not when I shall search into your Treasure.
1772		G. Stevens ‘Mutual Love’ Songs Comic and Satyrical 109: They’ve talk’d of my Treasure, they’ve call’d it a Gem, / To be sure so it is, but it is not for them.
1787		Harris’s List of Covent-Garden Ladies 68: She scruples not to expose to public view her choicest treasure.
a.1796		Burns ‘O Saw Ye My Maggy’ Merry Muses of Caledonia (1965) 62: My Maggy has a treasure, / A hidden mine o’ pleasure .
1896		Farmer Vocabula Amatoria (1966) 257: Trésor, m. 1. The female pudendum; ‘the treasure.’.
1986		R. Campbell In La-La Land We Trust (1999) 65: Man or boy wanted to fiddle with her treasure, he had to work for it. No quick and easy roll me over in the clover.
1995		R. Campbell Wizard of La-La Land (1999) 137: Any woman with two tits and a treasure can make practically any man sit up and beg for it like a puppy dog.
2000		Desdemona at www.asstr.org 🌐 She was always careful not to push in too far because she knew she had to save her treasure for her first client.

2. the penis.

c.1707		‘The Long Vacation’ in Farmer Merry Songs and Ballads (1897) IV 136: When Quality withdrew / To their Grotto’s of Pleasure, / And Ladies to the Wells, / To spend their Lord’s Treasure.
1835		‘Pressing, Caressing, & Keeping So Close’ Knowing Chaunter 23: Chloe blushed crimson, you well may be sure, / For she never had seen Lubin’s treasure before.