Thanks for your post Vikki. And there I was thinking that I had asked a rhetorical question...shows how long it's been since I read biology.
However, the main problem is that theologians and biologists use the word 'natural' to mean different things. Biologists (or indeed anyone from the field of natural philosophy) will conclude that anything they observe in nature = natural. But a theologian uses the word 'natural' in a different sense. He looks at a thing and asks 'what is its intended purpose?'
But despite the accounts of animal homosexuality, I'm sure even the biologists would be forced to concede that the
main reason that sex exists is procreation. Yes, they may argue that sex is used for other purposes, even that homosexuality has apparent benefits, and that these acts are 'natural' (in their definition of the word), but the reason sex exists
at all and the reason that those sodomite monkeys are even here today is because of the primary function of sex, that is procreation.
VikkiKate89 said:
What sex SHOULD be primarily for on the other hand is probably going to be debated till the end of days since there's even division in the Christian faith on whether it should be for reproduction only, or if sex with your spouse whenever you feel like it is okay too.
Would it interest you to know that it is only relatively recently that this has become a topic of debate in Christendom? Longstanding Christian tradition had always affirmed the primacy of procreation when it comes to sex. This universal belief was only seriously undermined as recently as the '20s (or thereabouts, I think) when the Anglican Church decided that artificial contraception was moral in some cases. I speculate that it is the rise in the acceptability of birth control among Christians that has led to our present state where it is no longer taken as read that sex is primarily for procreation, which has obvious implications when it comes to the present debates over homosexuality.
Just one further note, so as to avoid misundertandings: I have tried to be careful to always refer to procreation as the
primary function of the sexual faculty (as opposed to
only). Of course sex has other purposes (it is unitive, it is pleasurable etc.) but the Natural Law argument posits that these things are subservient to the procreative aspect. In this way, there is nothing immoral about having sex for pleasure, just as long as one is open to the possibility of procreation. Sexual acts, which by their nature are infertile, or positive actions taken or intentions to negate the possibility of reproduction (such as artificial contraception) would all be contrary to Natural Law, since they are subverting or frustrating the primary end of the sexual faculty.