"be consistent and have the same amendment forbidding masturbation (and get the feds into our teenagers' bedrooms with cameras to enforce it) and any extra marital "fornication". As a matter of fact, if the amendment you propose would be comprehensive, I might support it on "religious grounds". Add to it forbidding consumption of pork as well."
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Zeev...
Your argument assumes an equivalence between an amendment to deny same sex marriages and an amendment to ban homosexual acts -- that is clearly not the case. The proposed amendment merely defines marriage as being exclusively between a man and a woman, and has nothing to say about "forbidding" homosexuality or homosexual acts.
If the amendment forbade homosexual acts, your argument would have some validity and thus would be worth considering.
mlsoft
In edit: The only reason the amendment is needed is because the interstate commerce clause of the constitution mandates that when a state blesses a marriage as a legal union, other states must recognize that marriage also. While that interpretation has sometimes been successfully challenged on other issues, without the new amendment the courts are perfectly free to force any given state to recognize a homosexual "marriage" that was performed in another state that has legalized homosexual marriage. That would be a travesty of democracy for those states (probably a large majority) whose citizens oppose same sex marriages.
mlsoft