The argument from nature boils down to the assertion: this is not natural therefore it is morally wrong.The argument has been used against homosexuality, and it is often brought out in the contexts of assisted dying, modern reproductive technologies, and genetics. The argument is problematic in at least three ways.
First, it is not clear what it means to say that something is unnatural. If 10 per cent of humans are predominantly homosexual, and homosexual behaviour is seen in other species, what is meant by saying that homosexuality is unnatural?
Second, it seems quite unclear why it should follow from the fact that something is unnatural, that it is morally wrong. What kind of reason could be given in support of this?
Third, there are an enormous number of counter-examples, not least from medical practice itself, to the claim that what is unnatural is morally wrong. The life of a child with meningitis may be saved by antibiotics and intensive care. Neither treatment is ‘natural’ on any meaning that can be given to that term, but we don’t consider either to be morally wrong.引自 3. A toolbox of reasoning
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