The crux seem to me to be the fact that homosexual couples cannot reproduce and without help from heterosexuals they can never fulfil themselves by producing or nurturing offspring.
This in itself is against the primary law of nature, which is that the species must survive.

Can anyone believe that someone can proudly come on here and shamelessly spout this tripe?

Let's see how the following fit in with ake's view of the "primary law of nature" (which, by the way, was clearly not invented until dicks 'n' fannies came along, about three billion years after life began...). No wanking. No sex if you are unfortunate enough to be sterile. No sex if you've had a vasectomy. No sex if you're past the menopause. No sex if you've had six kids already and don't want any more. No sex if you're too poor to afford kids. Do you know summat, ake? You don't know anything about the primary laws of anything. You make up primary laws to fit your prejudices. "Species must survive"? Really? Are you actually aware that 99.9% of all the species that got going on this planet have not survived? I'll give you credit for one thing at least: you don't indulge in other people's predigested gobbets of egregious tripe - you make up your own as you go along. Stroll on.