There is a major difference between being born Ex Genere and becoming gay. A great misjustice is done when the reality is not considered.
Acting and being are not the same thing. Being has nothing to do with acting. Acting has nothing to do with being. Being born with the mental state (NOT a mental malady) that creates the same gender attraction does NOT mean you are gay. It means you could be gay. For a detailed explanation of that mental state read HOW TO TELL IF YOU WERE BORN GAY.
* = There is no accepted term for the naturally born homosexual condition. "Ex Genere" solves that.