As much as people on the Nurture end of the debate would like to convince you otherwise, sometimes you can already tell a kid is gay when he's in the first grade. I know some gay first-graders, and some of them wear sweater vests, some are into Hannah Montana, and some of them the only word you would use to describe them is "sassy."
Now, if you're going to try to tell me that there is something you could do as a parent to keep your kid from "going gay," then how do you explain gay first graders?
Parents, if your kid is playing Double Dutch at recess and he wants an Easy Bake Oven, don't go into panic mode and try to send him to some sort of Christian camp where they try to pray the gay out of him. Just consider this a time to start preparing yourself for the idea. Sure, his life might be difficult for a while with the teasing and fear of coming out, so why make it worse on him by putting added pressure of shunning parents on him?
Gay first graders are a reality people, and they're kind of cute, so it's time you accept it.