Homosexual attraction in itself is natural. However, the Bible states quite clearly that actual homosexual intercourse is a sin.
I think it's important that children know that some people are attracted to the same sex and that unfortunately, some of them will turn out to be too. But also, they need to be taught that God doesn't want them to actively practise homosexuality.
Let us remember that God loves homosexuals just as He loves everyone else and He has the power to help them if they truly want to change.
We love sinners, but we don't love sin.
I guess in this instance, it would be up to the parents to explain to their children about the matter. Personally, I would not actually prevent my children from watching it and I would not encourage them to have any hatred towards homosexuals. If one of them turned out to be a homosexual, I would not love them any less, but I would advise them to abstain from sexual relationships.