Right. Selfish genes don't necessarily need to be beneficial for every individual that carries them. Queen bees have evolved -- through regular Darwinian evolut

Right. Selfish genes don't necessarily need to be beneficial for every individual that carries them. Queen bees have evolved -- through regular Darwinian evolution -- the trait of having a majority sterile offspring. Those genes don't help the worker bees, but they help the queen and so get passed down. If you have a genetic mutation that means 1/4 of your offspring won't bear their own children, but will increase the likelihood of your grandchildren living to adulthood, that may well be something that gets selected for. Not saying that this is necessarily the case with "gay genes," simply that it is perfectly consistent with standard evolution.