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[Chuck the plant]

Assuming, for the sake of argument, that hormones are the sole determinant for whether one is hetero- or homosexual: what determines what hormones are produced?

What you're trying to get at? That homosexuals produce those hormones "on purpose"? Do you have ANY clue about biochemistry at all?

EDIT:

Food for thought: assuming that homosexuality IS normal, then why is it that pedofilia, zoofilia, and necrofilia aren't considered normal? One could argue that people could have the same urges homosexuals do, just directed at kids, animals, or corpses.

Rather a snack, actually.
First off: There are/were societies that found one, two or all of those "perfectly normal"´.
Second: Why WE don't consider THIS to be "normal" anymore? Ever heard of that little detail in sexual relations called "consent"?