The most read text book and the perennial sales leader in the US, regardless of genre, The Bible, touches on that subject.
I can't say that the Bible says bad things about this form of deviancy but it certainly doesn't promote it. The key passage that rings in my ear: For the wages of sin is death
Do you interpret that as meaning non-existence after earthly demise? If so, that probably fancies many unfortunately atheist homosexuals just fine.
I didn't think the Bible was a public school textbook? I'm guessing this ruling covers religious schools?