First off I'd like to tip my hat to the people contributing to this thread. Some excellant arguments are raised in thoughtful manners. Trully a debate and not a series of slanderous attacks.
2ndly, I shouldn't be commenting on anything as I just woke up and it's never a good to compose.

And with that disclaimer....
Eugenics. Ack. Horrifying. Monstrous. Unavoidable. And it's already here to a large extent. Hundreds of thousands of blacks being sterilized in the government experiements years ago. Sterilization of mentally challanged people not so long ago. And today.... if you're rich, well connected, there are a host of genetic 'influences' which can be added/subtracted to your potential children.
I was glancing over some stats the other day of labour jobs being slashed world-wide and it's indicative of trends which started about a hundred years ago and have been escalating ever since. Soon there will be very few 'labour' jobs (from around 80% of all available jobs down now to around 30%). The various governments' doll programs are barely adequate to keep someone alive, and seem, for the most part, to be nothing more than a base-minimum to strangle the working class or 'poor' into oblivion quietly. ie, give them a few bucks,just enough to eat basic, low-quality foods, enough to afford some tiny ill-placed abode. Certainly not enough for people to consider raising children in. Not enough to build healthy relationships with themselves or others in.
Then there's the criminal aspect. Correct me if I'm wrong, but I've heard some 80% of the inmates in American prisons are black. Here in Canada a goodly percentage of our inmates are aborigines. Looking beyond race or color, what do probably 95% of inmates have in common? They are poor.
So.... how many children do jailed men or women beget? A few, no doubt, but for the most part this whole group is sterilized in a sense.
I'm rambling and the whole eugenics thing isn't what I wanted to address anyway. I will say a bit more on it before putting this Hydra back into it's cage. Many of our most significant souls have come from the poorest, most ill-treated of families. Many of our 'geniuses' can easily be classified as nut-cases. We all inherently want to pussy-foot around the topic of eugenics, especially after the late-great Adolf made such a point of tackling the issue head-on. Yet we are in a system which actively, in one way or another, supports various forms of eugenics.
A brief, but related story, one pointing out the conflict I have with this topic. I was sitting in my car one day (I live out of my car at work) and this guy comes along in a souped-up wheel chair. The kind which is designed for someone who's very disabled. I noticed him coming up the street in my rear-view mirror, noticed that he was yelling and screaming. Then he comes up beside my car and smashes it with his fist as hard as he can. I sat there.... fuming. My taxes keep that guy alive. He'd never have survived 5,000 years ago more than 10 minutes after birth. He's around 50 years old now and my taxes have been keeping him going this whole time and he smashes my car. My car which costs me way too much and is the source of endless taxings. So, being a writer, a wrote a poem about the whole thing. Which I'll save you all from reading as poets garner as much love as used bubble-gum stuck under railings.
ANYway.... it seems to me that this whole topic has started to address the legitimacy of the marriage concept. I'm 39 and not married. Nor will I ever. Yes it's convenient, especially legally in a variety of ways, and offers a ready-made legal shelter program for children, but honestly.... our species just isn't cut out for it. We've been given the marriage idea as a religious necessity, a state sanctioned necessity, and have swallowed the hook along with the bait.
No, it isn't necessary for the raising of children. Throughout our history, and on-going today in very healthy cultures, the tribe as a whole raises the children (something we're leaning towards, albeit in an awkward way, with day-cares). Someone made the point that children need to be raised by opposite-sex parents to be healthy. In point of fact most day cares are run by and staffed by women. The child spends most of it's day-time hours there and certainly recieves most of it's tutoring there. Does this mean these women are lesbians? That they will have horrific impact on the children?
A greek, some 5,000 years ago wrote something which has become famous, and which I can't quote directly, but paraphrased, "The children of today, unlike any other time, behave horribly. Clearly their behaviour is indicative of our declining culture and values."
Children don't need to be housed in a home with opposite sex parents to be healthy. They need a vareity of healthy guides throughout their early years. They need good nutrition, exposure to stimulating ideas and activities and someone willing to change those toxic diapers they so happily fill.
Personally I co-habitate with someone until the point that the relationship is stagnant. Would I eat steak every day, every meal for the rest of my life even if I love steak? No... I need diversity in diet, whether that be nutrition, spiritual, emotional, mental, physical etc. That doesn't mean I date someone new every week. I usually settle down with a girl for about 5 years.
Ok... my rambling tirade is done. My appologies it wasn't as succinct as many of the arguments posted here.
Cheers folks, and cudos to everyone for being so vocal.
Keekanoo.