Technically you're not asking your wife for an open marriage if you've already been fucking another woman for six years. You're presenting your wife with an ultimatum. That doesn't make you a proponent of open marriage, Newt, it makes you a CPOS.
CPOS means Cheating Piece of Shit for any non Savage literate readers.
Definition of Swingrich:
"Swingrich" is a CPOS masquerading as a swinger/polyamorous person. "I thought he was ethically nonmonogamous but he was just a swingrich."