CBS' Monday night sitcoms are pushing limits in broadcast prime time with risque humor. From left, Kat Dennings, Beth Behrs and Jennifer Coolidge in a scene from "2 Broke Girls." (CBS Entertainment via Associated Press)
Melissa McCarthy and Billy Gardell (right) trade raunchy one-liners as Reno Wilson looks on in a scene from "Mike & Molly," one of four Monday night CBS sitcoms. (CBS Entertainment via Associated Press)
In this photo released by CBS, host David Letterman, right, and comic Jay Thomas get ready to throw footballs at the Late Show Christmas tree during the annual Late Show Holiday Quarterback Challenge on the set of "Late Show with David Letterman," airing Thursday, Dec. 23, 2011 on the CBS Television Network. Thomas and Letterman each take turns tossing footballs at the Late Show Christmas tree to try and knock off the giant meatball perched at its top. (AP Photo/CBS, John Paul Filo)
In this screen grab provided by CBS, former Penn State graduate assistant Mike McQueary (left) speaks to CBS News chief investigative correspondent Armen Keteyian on Nov. 15, 2011, at an unknown location. McQueary is cited by a grand jury report as witnessing Jerry Sandusky allegedly sodomizing a 10-year-old boy in a Penn State locker room. (Associated Press/CBS)
In this image released by CBS, from left, Erica Hill, Gayle King and Charlie Rose, the new hosts of a morning show that will replace "The Early Show," are shown in New York on Tuesday, Nov. 15, 2011. The network said Tuesday the perennially third-rated morning show will change its name, but didn't announce a new one. The new show premieres Jan. 9, 2012, and will air from 7:00-9:00 AM EST on CBS. (AP Photo/CBS, Craig Blankenhorn)
Wofford College Freshmen, from left to right, Charles Johnson, Corey Holcomb and Bradley Lara walk by a CBS anchor remote location located behind the Wofford College main building in Spartanburg, S.C., on Thursday, Nov. 10, 2011, as CBS crews prepare for the Republican presidential debate that will held Saturday, Nov. 12, 2011, at 8 p.m. (AP Photo/Spartanburg Herald-Journal/Michael Justus)
** FILE ** In this April 21, 2010 file photo released by CBS, host David Letterman is shown on the set of the "Late Show with David Letterman," in New York. Letterman is back at "Late Show" Monday, Aug. 22, 2011, after a two-week vacation, his first day at work since a threat against his life was posted on a website. Last week, a frequent contributor to a jihadist website urged Muslim followers to "cut the tongue" of the late-night host because of a joke Letterman had made about al Qaeda leaders. (AP Photo/CBS, Heather Wines)
In this undated TV image originally released by CBS, Vivian Vance, left, and Lucille Ball are shown in a scene from the comedy series, "I Love Lucy." Ball, who died on April 26, 1989, would have celebrated her 100th birthday on Saturday, Aug. 6, 2011. (AP Photo/CBS, file)
Associated Press photographs
Marion Ross and the now-deceased Tom Bosley, seen here in December 2004, were co-stars for 10 years on TV's “Happy Days.” She and his widow, along with other cast members, are suing CBS for more royalties from sales of “Happy Days”-themed merchandise.
The cast of "Big Brother 13" consists of eight new guests and a few power duos from previous seasons. The new chapter of the voyeuristic reality TV series, titled "Double Trouble," premieres Thursday on CBS.
Former House Speaker Newt Gingrich, who is running for the Republican presidential nomination, appears on CBS' "Face the Nation" on Sunday, May 22, 2011, in Washington. (AP Photo/CBS News, Chris Usher)