4th, I refuse to believe a child at 5 years old, on their own accord, who hasn't even gone through puberty which initiates sexual attraction… knows that they are "gay," "straight," etc..
Leave children alone. Don't talk about sexual adult subjects wether hetero, gay, poly, bi, or whatever subjects that are rooted in sexual preferences and orientation.
Sickos out there playing to your manipulated appeals of emotion.
Teach math, science, reading and writing. It's up to the parents for everything else.