How I Met Your Mother and Harold & Kumar, weighed in on the casting debate in a Thursday interview with U.K. newspaper The Times.“I think there’s something sexy about casting a straight actor to play a gay role — if they’re willing to invest a lot into it,” Harris said.“I played a character for nine years who was nothing like me,” the 47-year-old actor said of his Mother role of the woman-loving Barney. “I would definitely want to hire the best actor.”“In our world that we live in you can’t really as a director demand that [an actor be a given sexual orientation],” he added. “Who’s to determine how gay someone is?”Harris was discussing his new role portraying Henry Coltrane in It’s a Sin, an AIDS drama from Russell T.