The cinetrix is loving Nerve's Hollywood Guide to Infidelity. Here's a forbidden taste:
Married professors, even after a lifetime of fidelity, will inevitably begin an affair with that one special student.
See: The Squid and the Whale, Husbands and Wives, The Rules of Attraction, Terms of Endearment, Wonder Boys, What Lies Beneath, The Oh in Ohio
It's possible to be married and faithful, just not in a Woody Allen film.
See: Manhattan, A Midsummer Night's Sex Comedy, Hannah and Her Sisters, Crimes and Misdemeanors, Husbands and Wives, Bullets Over Broadway, Everyone Says I Love You, Match Point
Did they miss anything? Pipe up in the comments.