COMEDY Partners CBS, CITY-TV, 8:30 p.m. ET/PT Last season, CBS claimed to break new ground by putting plus-sized people on TV with the hit sitcom Mike & Molly; this fall, it’s breaking down gay stereotypes in this new comedy. Launching tonight, Partners is allegedly based on the real-life experiences of best-buddy TV producers Max Mutchnik (he’s gay) and David Kohan (he’s straight), best known for creating and running the sitcom Will & Grace for several seasons. In this setup, their personalities are morphed into the characters of the successful and painfully straight architect Joe (David Krumholtz) and his best pal and co-worker Louis (Michael Urie), who is outrageously gay. The odd-couple principals are there for each other in tonight’s opener as Joe proposes to his gorgeous girlfriend Ali (Sophia Bush) while Louis navigates his own relationship hiccups with nurse boyfriend Wyatt (Brandon Routh). Isn’t it bromantic?