Jesuit, n. — Green’s Dictionary of Slang

Jesuit n.

[the contemporary suspicion of Jesuits, who were thus branded with a suitably repellent image]

a male homosexual; thus the jesuits’ fraternity, the world of homosexuality; Jesuit box, to masturbate.

1744		Machine 11: Selfish Letcher that does Jesuit box, / Or Huffling, Gigging, Semigigging, Larking, / Or that queer Practice, by the Cull call’d Barking.
1937–84		Partridge DSUE (1984) 617/2: c.1630–1820.