Cabler Showtime topped GLAAD's sixth annual report on gay-inclusive broadcasting, while the CW led the networks.

Showtime scored a “good” rating on the Gay & Lesbian Alliance Against Defamation's (GLAAD) Network Responsibility Index (NRI) released Thursday. The cabler positively depicted the lives of gay, lesbian, bisexual and transgender characters in 46 percent of its original programming. Reality series The Real L Word, an L Word spinoff now in its third season that revolves around the lives of a group of lesbians living in Los Angeles, was singled out for highest overall number of individual LGBT impressions on the network. Showtime scored 37 percent last year.

ABC Family also scored high marks with 34 percent, but its score was down from last year's 55 percent high. Many of its shows, such as Pretty Little Liars and The Secret Life of the American Teenager, are aimed at a younger audience.

For the report, GLAAD combed through thousands of prime-time hours from the five major network broadcasters (ABC, CBS, NBC, Fox and the CW) and 10 prominent cable networks (ABC Family, MTV, FX, HBO, Showtime, TBS, TNT, History, TLC and USA) for positive gay themes or characters aired between June 1, 2011 and May 31, 2012.

The CW led the networks for the third year in a row with 29 percent. Shows such as 90210 and America's Next Top Model helped the network retain the top spot. The CW, Fox (24%) and ABC (27%) scored a “good” rating, while NBC (19%) was rated “adequate” and CBS (8%) “failing.”

NBC and CBS, both of which have struggled in recent years to diversify their programming, are premiering gay-themed shows this year. The New Normal, which features a gay couple trying to start a family, premieres September 11 on NBC. And CBS is hoping it has a hit in the new sitcom Partners from Will & Grace creators David Kohan and Max Mutchnick.

(Related: The New Normal: Free preview now available.)