Dread you were unfairly -1'ed for your opinion which is wrong, I have addressed the balance.
The welfare of the child MUST be paramount, a loving committed parrent(s) (no matter what its make up ) is the correct correct way to bring children up.
Oh and on the subject of nature v nurture - thats a whole other story
On the matter of gay marriage I will say that it is long overdue. What two consenting adults get up to shouldnt be any of the governments business.
On children, I can see the arguements visa vie loving homes etc but i'm just of the old school who was taught that you have a mummy and a daddy and everyone lives happily ever after. Of course I realise that's total rubbish but old habits (or ideas) are hard to break.
Personally I don't get why people would want kids in the first place, but I guess if people want to be married and miserable they might as well have children too and be doubly miserable