Green’s Dictionary of Slang

(Can.) a condom.

1974		(con. 1940s) E. Thompson Tattoo (1977) 129: Sheiks and Trojans, Rameses and Durex were racked beside the pharmaceutical cash register.
1988		Totally True Diaries of an Eighties Roller Queen 🌐 22 May Steve tried to pick up a 16-year-old but he couldn’t find a sheik.