“It’s unnatural” is the oldest argument against us. Biology says the claim is untrue, and humanism says it’s irrelevant.

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For centuries, one of the favourite arguments against LGBTQIA+ people has been that we are “unnatural”. It has been used to justify bad laws, bad medicine and bad theology, and it still turns up in debates about discrimination and conversion practices. Let’s take it seriously for a moment, because the biology is not on its side.
The Birds and the Bees
In 1999, biologist Bruce Bagemihl published Biological Exuberance, which gathered more than two centuries of zoological research. Reviewers summarised it as documenting same-sex pairing, parenting and play in some 450 species, from whiptail lizards and flamingos to bottlenose dolphins, vampire bats and giraffes.
A word of caution. Biologists usually say “same-sex sexual behaviour” rather than “homosexuality” for animals, because we can’t assume that animals have identities or motives like ours. The behaviour, though, is real and widespread. For decades it was explained away as dominance, aggression or mistaken identity. Bagemihl argued that the explanation was simpler: nature is not always economical. Abundance and variety are part of how living systems work, not mistakes in them.
“Unnatural” is not an argument
Suppose the animals did none of this. It still wouldn’t matter. Here the humanist answer is simpler than the biological one: nature is not a moral authority.
Cancer, malaria and being eaten by sharks are all natural, and nobody thinks they are desirable or moral. Infanticide is widespread among animals, and parasitoid wasp larvae eat living caterpillars from the inside, a habit that troubled Darwin himself.
Antibiotics, on the other hand, are unnatural. So are reading glasses, vaccines, heart surgery and aeroplanes, and so is the screen you are using to read this article. No one refuses chemotherapy because the body didn’t make it. In practice, “natural” gets invoked only when it suits a prejudice that already exists.
What decides how we treat each other is the harm we cause or prevent, and whether people can live honestly and safely. Biology can remove a false premise, but the case for equality never rested on it.
From bad biology to real harm
The “unnatural” claim does more than hurt feelings. It underpins conversion practices, which try to change or suppress someone’s sexuality or gender identity and are based, as Equality Australia puts it, on the lie that LGBTQIA+ people are broken. Queensland passed the first ban in 2020, followed by the ACT and Victoria, and more recently New South Wales and South Australia. Queensland’s 2020 law applied only to health settings, which, advocates note, leaves out the religious settings where most such practices occur. Tasmania released a consultation draft of a Conversion Practices Prohibition Bill this year, and Equality Australia has made a submission on it.
Even if “unnatural” were true, there would be nothing to cure. And it isn’t true.
What nature does show
September is Biodiversity Month in Australia, so it’s a good time to remember what nature can and can’t tell us. It can’t tell us what’s right, but it can show us what’s resilient. Ecosystems tend to be sturdier when they contain many kinds of organisms, behaviours and strategies, and monocultures are fragile. A community that tries to stamp out difference makes itself less resilient, and so does a society.
So the next time someone says we’re against nature, we can agree that nature is wonderfully varied. Then we can ask why they want a world with less of it.
(c) 2026 Rainbow Humanists. All rights hereby returned to the original author. We acknowledge the Wurundjeri people of the Kulin Nation, the Traditional Custodians of the land on which this material was prepared, and pay our respects to Elders past and present.






