Marriage doesn't 'curtail promiscuity'; self control curtails promiscuity. Dave is confusing cause and effect.So you would deny an institution where one of the benefits to society is people entering into a monogamous relationship, curtailing promiscuity,
I've never chastised anyone for their private sexual behavior. Further; I've always said there's nothing wrong with homosexuals or homosexuality. I'm opposed to radically redefining marriage; I'm not opposed to gays, lesbians or bisexuals. Many homosexuals oppose same sex marriage.but then turn around and chastise those same people for being promiscuous
One of the reasons I support marriage as one man and one woman is because considering two men as married would decrease monogamy in marriage.and use that as the reason to deny them the institution of marriage.
If you value monogamy; keep marriage as one man and one woman.