I don't disagree with you about promiscuity being harmful to everyone.  But AIDS rates (and of other STDs, btw) indicate that there is a bigger promiscuity issue with male homosexuals.  Of course, the "National Association of Gay Monogamy" is trying to change that, but....oh, wait, there is not such association.

Children are a separate issue that we can discuss elsewhere (again, I only brought it up to call attention to the fact that there are lots of clearly sinful acts that Jesus never mentioned, but that didn't make them non-sins as a result)

The issue I have with homosexuality as it relates to children in the present discussion is the equating of homosexual relationships and sodomy with male-female unions and sex.  Because what is clear from history is that same-sex sexual acts are teachable; consider the pederasts of Ancient Greece.  When we legally equate sex to sodomy, then when we teach about sex on school, we must also teach about sodomy.  The "closet" was the best solution.