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Should straight actors play gay roles?
Gay actors are not necessarily better at portraying a gay character.
Acting any role (gay or not) requires a large set of specific skills. Reducing the scope of casting to a minority reduces the chances of finding an actor with the exact set of skills for the role.
Gay people are not physically different than other people, so an heterosexual actor can seem as realistic on-screen as a gay one to play an homosexual character.