Incest loving atheists?

In an update on my post below, I notice that one scurvy wag got on there and attempted to put these atheists' feet to the fire about marriage discrimination.  He's right, of course.  As I've said before, it's only marriage equality if any combination of adults can get married, not just homosexuals. 

Well, not to be outmaneuvered, our brave new world advocates step in and make our brave interloper look foolish by explaining that this whole incest and polygamy things are just forbidden based on archaic emotions anyway.  Except for a few biological problems that science and medicine may be able to help with, there's not thing one wrong with good old incest, bother and sister, polyamorous sex, heck maybe even mom and son and dad and daughter (providing, of course, consent is in the equation).

Once more, from the top.  Any idea that this is not a revolution to obliterate the Christian/Jewish foundations of the West, and replace it with a shadowy mockery of pre-Christian barbarism and debauchery should, by now, be all but put to rest.  FWIW, I particularly liked the comments where the gay rights atheists scream 'paranoia and fear mongering' over bringing the whole incest question up, even while others are arguing for its potential legitimacy.  That should speak volumes right there.