put, n.² — Green’s Dictionary of Slang

put n.²

[SE put, a card-game + pun on put, an act of thrusting or pushing and in 1. the vagina being ‘dark’; 2. SE two-handed, whole-hearted ]

put in the dark (n.)

sexual intercourse.

1685

Catologue of Contented Cuckolds [ballad] At midnight sometimes she returns with a Spark, / Say, I sometimes have found her at Put in the dark.

two-handed put (n.)

sexual intercourse.

1788, 1796		Grose Classical Dict. of the Vulgar Tongue (2nd, 3rd edn).
1811		Lex. Balatronicum.
1890–1904		Farmer & Henley Sl. and Its Analogues.