“Mistresses” (8 p.m., BBC America): Not-so-desperate wives cheat. Some have fun; others

“Mistresses” (8 p.m., BBC America): Not-so-desperate wives cheat. Some have fun; others don’t.

“Friday Night Lights” (9 p.m., NBC): What more do we have to do to get you to watch the underloved “Friday Night Lights” — one of the top dramas on all of TV?