LOS ANGELES—In an Ellen-like ploy for higher ratings, the producers of A&E's Biography have chosen to reveal the homosexuality of host Peter Graves. "I am a gay man," Graves announced Monday on the season-ending episode of Biography, which chronicled the life of silent film legend Buster Keaton. As clips from Keaton's film career were shown, Graves spoke of the joy he has long derived from the committed, loving relationship he enjoys with his longtime partner, Stan. "I love my boyfriend Stan more than anything in the whole world," Graves said. No sponsors pulled out of the show.