Why is a homosexual act a sin when it hurts no one?

I don't know.

u/BruhSoundEffect-78: I have zero reason to see how being homosexual is wrong and/or can hurt yourself or others. It has zero logic to me.

Right, according to your logic of morality. In the beginning, Adam and Eve made a similar mistake. They wanted their own abilities to decide what is good or bad, independent from God and they did by eating the fruit of from the tree of the knowledge of good and evil.

u/ErnestLanzer, u/IHaveManyAliases, u/ChardMell