Let me get this straight. (no pun intended) You want a study that proves procreation is between a man and a woman?What about hetero couples who are unable or unwilling to reproduce, should we make it so they can't be married either? Prove that it has no scientific basis in genetics. They did do a study and found out that there was no specific gay gene, but that's about it. Find me an unbiased scientific study that says what you are asserting here.
Actually that's exactly what you said since you failed to mention any other group who opposes gay marriage for reasons other than religion.That's not what I said, is it? I was referring specifically to people who oppose gay marriage for religious reasons...which makes up quite a large number of people who oppose gay marriage.
As long as you understand you are speaking from personal opinion not based on facts.Over the years I've seen a lot of arguments against gay marriage, and not one of them has been legitimate or worthwhile. Most of it is based in unwarranted paranoia.
But there you go. Why stop at consenting adults? This is where you fall off the wagon. Kids can drive at 16. Why can't they marry a 40 year old?Case in point. What other lifestyles are you referring to? Are you specifically referring to polygamy? If so, I have no problem with that being legalized either. As long as consenting adults are involved I see no problem.
Because society made a moral judgment on where we defined marriage. Same thing as drawing a line at gay marriage.