Is it ensure, insure, or assure?
A condom; rubber: If a guy said ''I ride bareback,'' I'd tell him he needs a raincoat. Instead of gonorrhea, I'd talk about the clap (1980s+)
waterproof outercoat or raincoat, named after a Scottish chemist, Charles Macintosh (1766-1843), who invented the waterproof material that bears his name. The fabric used for a mackintosh was made waterproof by cementing two thicknesses of it together with rubber dissolved in a coal-tar naphtha solution