1. To copulate. See copulation for synonyms. A Shakespearean euphemism still popular today. Quotes:
(1) Quote: Lawrence Paros, The Erotic Tongue (1984): ' Doctors do IT with patience / Lawyers do IT briefly / Accountants do IT figuratively / Publishers do IT periodically / Dante did IT divinely / Marx did IT in a revolting fashion / Michaelangelo did IT on the ceiling / Moses did IT on the rush / Sinatra did IT my way.'
(3) Let's Do It by Cole Porter (1928): ' Birds do it... Let's fell in love.'
(4) Paul (John Malkovich) in Shadows and Fog (1992): ' I never do it with a whore. You start out with a burningdesire and you end up in the morning with a burning sensation, if you know what I mean.'
(5) Molly McKenna (Frances Fisher) to Sergeant Mike Pamer (Bruce Weitz) in Molly & Gina (1994): ' I'd rather do it with Donald Duck.'
(6) Pino (Anthony de Sando) and a lesbian in Kiss Me Guido (1998): -- Pino: ' You're a lesbian? (...) You like girls? That's cool, me too, but you have no desire to do it with a guy? ' -- Lesbian: ' Do you? ' -- Pino: ' That's disgusting! ' -- Lesbian: ' Exactly.'