What is so horrible about saying that sometimes people of the same sex love each other? Even to a kindergartner? They don't have crazy images of gay bondage parties running through their heads, like most people who freak out over Teh Gay do. They just see two men or women holding hands or hugging. The horror!!
What exactly are you afraid of them being "indoctrinated" into? Being gay? You really think that's how it works? They hear of gayness before the age of 30 and *poof* they're gay in a burst of glitter?
Or perhaps, "indoctrinated" into being ok with gay people? So maybe they won't grow up to beat the gay kids so bad they wind up in the hospital for a week, like they did at my high school? This was only a few years ago, by the way. In the suburb of a major city. Oh gee, what a shame. Whatever will we do if people stop thinking gay people are out to rape them at every turn?
What exactly are they being indoctrinated into?