My answer to this question on Quora: Note: Most answers to this question were very PC and stupid. Many answerers were gay themselves or Cultural Left straights. Many said, “Well no, maybe he’s straight and he just wants to keep his sex life private or he thinks it’s a rude question.” This is a standard Gay IP Cultural Left retarded answer, and I don’t think it’s true at all. It’s just one more way the Cultural Left lies about its favorite subject, homosexuality.
As a good general rule, yes of course it means they are gay. I suppose there have been some cases where some straight actors have given that answer also, but I sure would like to hear about them. Whenever I hear an actor say their sexuality is private, I simply assume that they are gay. I haven’t been wrong yet.