polygamy in many cases results in an underaged girl being promised and then brainwashed to a much older man. Incest carries a dangerous bullet of almost guaranteed birth defects and bestiality is cruel and unusual to the animals involved.
Homosexual marriage is no different than heterosexual marriage except for both have the same genitalia. Both enter into the agreement of their own free will.
To argue that they have to fight for those 'other' things is arguing the slippery slope and that is a losing argument.
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