I think people feel threatened by homosexuality. The problem isn't about gay people the problem is about the attitude towards gay people. People think that all gays are Hannibal Lecters. But gay people are sons and daughters politicians and doctors American heroes and daughters of American heroes.
Science Fiction is not just about the future of space ships travelling to other planets it is fiction based on science and I am using science as my basis for my fiction but it's the science of prehistory - palaeontology and archaeology - rather than astronomy or physics.