I think the thing that needs to be recognized here by the supreme court or where ever this ends up, whether two people of the same sex gives you the creeps or not, is that being gay is obviously not a choice that is made. Being a biologist it's hard for me to understand the "phenomena" in evolutionary terms because it doesn't make sense; if you are a man and like to have sex with a man it's very unlikely you will have an offspring to pass your "gay" gene on to. Regardless of whether science can explain it or not, clearly the only choice that is being made is to whether to stay in the closet about it, and I think if you look back over human history the proportion of homosexuals is the same, just the proportion that are out about it is greater now.