I also vote nay.
A kid that age doesn't even understand their own genitals, at least beyond whether they have to stand or sit to take a piss. All this talk of gay people and that LGBTXYZ shit is confusing enough for adults; to try and force that on kids is tantamount to child abuse imo.
Sexuality need not be taught in schools until the kids are near or at puberty. Before then, they are tabula rasas, blank slates -- not sure which end is up because they are simply not equipped with the mental and physical goods to process such things.
If, as per their late teens, they decide they only get hard or wet for the same sex, then more power to 'em. One of my nieces came out as bisexual, and I don't love her any less; if she's happy, I am. But she made that determination when she was 18, iirc, not some little kid driven by her parents to a wonky understanding of the natural order of things :/