A report on Hollywood films released Tuesday found only seven major studio films last year included

gay characters essential to the film's plot.

GLAAD's Studio Responsibility Index (SRI) “maps the quantity, quality and diversity of images of LGBT people in films released by the seven largest motion picture studios during the 2013 calendar year.”

Seventeen of Hollywood's 102 titles included minor characters identified as lesbian, gay or bisexual.

“The lack of substantial LGBT characters in mainstream film, in addition to the outdated humor and stereotypes suggests large Hollywood studios may be doing more harm than good when it comes to worldwide understanding of the LGBT community,” GLAAD CEO and President Sarah Kate Ellis said in announcing the report's findings. “These studios have the eyes and ears of millions of audience members, and should reflect the true fabric of our society rather than feed into the hatred and prejudice against LGBT people too often seen around the globe.”

Two studios, Paramount and Warner Brothers, received “failing” grades, while 20th Century Fox, Lionsgate, Universal Pictures and Walt Disney Studios received “adequate” grades.

Sony Columbia's film Mortal Instruments: City of Bones helped the studio receive a “good” grade.

The report found only 7 films pass the group's “Vito Russo Test” named after one of its co-founders.

To pass the test, characters cannot be solely or predominantly defined by their sexual orientation or gender identity and must be “tied into the plot in such a way that their removal would have a significant effect.”