Most Christians would call these two bad Christians. Even Christians who support marriage equality—liberal and progressive Christians—tend to frown on swinging, monogamish relationships, polyamory, etc. But I would argue that they're far worse swingers. I mean, who wants the guy fucking his wife pausing mid-thrust to inquire about whether he's accepted Jesus Christ as his personal savior? That would have to be a boner killer. A stranger on the bus inviting you to their church is bad enough. But getting that invite from the woman you're going down on while your husband watches?
Worse swingers or worst Christians? This calls for a Slog poll... (Via Christian Nightmares.)