"文化は不自然なもののみを禁じると主張する傾向があります。しかし、生物学的な視点から見ると、不自然なものなどありません。可能であるものは定義上自然でもあります。本当に不自然な行動、つまり自然の法則に反する行動は存在しえないのです。"

Simplified Meaning:

People often say that their cultural rules ban things that aren't "natural." However, if we look at it from a biological viewpoint, everything that happens in life is natural because it can occur. For example, some cultures might say that certain relationships are not natural, but from a biological standpoint, if those relationships happen, they are part of nature. Imagine how early humans might have thought it was unnatural to fly because birds do it and humans don't, but now airplanes make it clear that flying is just another possibility for humans. So, if something exists or can be done, it is natural. Anyone can apply this idea by being more open-minded and not judging others based on what they think is "unnatural." Instead, they can understand that nature is diverse and full of different possibilities, and people should accept that as part of life.