I certainly believe there is a gene. We have to have a gene that tells our bodies to reproduce, otherwise, how are we all here? And just like other genes, there can be mutations. It might seem rude to say homosexualit is a mutation, but think about it: we're all mutated some way. You might say that the gay gene can't be passed down because homosexuals can't reproduce, however, our ancestors job was to continue the line. Even today, homosexuals will marry the opposite sex and have offspring, suppressing their true desire because of their upbringing, society or their inabilty to accept themselves. You can be sure that has happened before. Also, it could just be a common mutation, like left-handedness-- it doesn't have to be a major change to be a mutation. It could happen all the time.
