(n.) - a series of brief depictions of sexual intercourse set to a jaunty 80s tune, summarizing a longer series of sexual events or escapades, normally shortened in order to coordinate well within the time constraints of the modern motion pictures.
John- "Oh, did you catch that awesome Glen Close sextage in her new movie, The Iron Lady?"
Bob- "Indubitably. Quite the sextage, if you know what I mean."
John- "I do indeed, sir. I do indeed."