They were regular in being gay, they learned little things that are things in being gay, they learned many little things that are things in being gay, they were gay every day, they were regular, they were gay, they were gay the same length of time every day, they were gay, they were quite regularly gay.
Gertrude Stein (1874–1946), U.S. author. repr. A Stein Reader, ed. Ulla E. Dydo, Northwestern University Press (1993). "Miss Furr and Miss Skeene," (written 1911), originally published Geography and Plays (1922).
Probably this is the genesis for the word "gay" being used as a euphemism for "homosexual;" in July 1923, when this story about two lesbians was published in the popular magazine Vanity Fair, the word became underground argot among homosexuals.