Originally Posted by
peadar1987
In fact, bananas exist to make more bananas. They are a product of natural selection. It just so happens that the most effective way for old-timey bananas to make more bananas was to be eaten by animals and have their seeds spread, so evolution dragged them in that direction.
Procreation is one of the core purposes of human sex, in the sense that anything has a purpose. However, "purpose" and "nature" don't reveal anything about morality. Humans have moved beyond just being creatures of instinct and self-preservation.
Incidentally, there are a lot of theories about how homosexuality has been beneficial in an evolutionary sense. They range from maintaining a critical mass of productive adults in a family unit without overloading things with kids, to research that suggests that the sisters of homosexuals are more fertile than women in the general population, hinting at some sort of genetic predisposition that is carried through the female lineage. It's interesting stuff.
Evolution is driven by random mutations, but it is itself not a random process. Lots of things are like this. Take the atmosphere as a (poor) example. Each individual atom or molecule in the air is moving at random, however, the fact that the atmosphere as a whole sticks there on the earth's surface is far from random.