From Partridge's Dictionary of Slang and Unconventional English: "Gay. (Of women) leading an immoral, or a harlot's, life: 1825, Westmacott (OED), In C. 20, coll., on verge of SE.--2. Slightly intoxicated; ob. C.19-20; Perhaps orig. a euphemism.--3. Impudent, imperrtient, presumptious: US (--1899), anglicized in 1915 by PG Wodehouse, OED (Sup.)." Also, gay house = brothel; gay in the arse = (Of women) loose; to lead a gay life = to live immorally; the gay instrument = the male member; gaying it = sexual intercourse. Funny how language changes even before we were born ...

Ceci n'est pas un seing.