It turns out some NBC affiliates were supposedly in talks to advertise AshleyMadison.com, a website that encourages married people to cheat on their spouses!
Emails were exchanged between NBC's New York affiliate and the site explains Ashley Madison's independent ad buyer, Jud Bardwell saying that an NBC ad rep:
“Confirmed with me verbally on about March 29th that two of the [ads] were approved to run in all the shows that he sent me rates on. We were going back and forth on The Marriage Ref and I indicated that Ashley Madison was planning on running in the 5/6 episode, and also that we were going to be sending a new creative for approval which was actually just submitted this morning [Monday].”
But a rep for NBC's affiliates said that although Ashley Madison approached them about buying air time, they did not agree to air the commercials.