# Quote — Jared Diamond, Why Is Sex Fun?

> Physiologists and molecular biologists regularly fall into the trap of overlooking this distinction, which is fundamental to biology, history, and human behavior. Physiology and molecular biology can do no more than identify proximate mechanisms; only evolutionary biology can provide ultimate causal explanations.

- Author: [Jared Diamond](https://www.leafyquotes.com/jared-diamond.md)
- Book: [Why Is Sex Fun?](https://www.leafyquotes.com/jared-diamond/why-is-sex-fun.md)
- Page: 108
- Source: [Wikiquote](https://en.wikiquote.org/wiki/Jared_Diamond#Why_Is_Sex_Fun%3F:_The_Evolution_of_Human_Sexuality_(1997)) ([CC BY-SA 4.0](https://creativecommons.org/licenses/by-sa/4.0/))
- Quote page: https://www.leafyquotes.com/jared-diamond/why-is-sex-fun/physiologists-and-molecular

## More from this book

> Though seemingly remote from human sexuality, shorebird sexuality is instructive because it illustrates the main message of this book: a species’ sexuality is molded by other aspects of the species’ biology. It’s easier for us to acknowledge this conclusion about shorebirds, to which we don’t apply moral standards, than about ourselves.

p. 29 — [Quote page](https://www.leafyquotes.com/jared-diamond/why-is-sex-fun/though-seemingly-remote.md)

> Behavior evolves through natural selection, just as anatomy does. Hence if sex is enjoyable, natural selection must have been responsible for that outcome.

p. 66 — [Quote page](https://www.leafyquotes.com/jared-diamond/why-is-sex-fun/behavior-evolves-through.md)

> Our sex is ultimately laid down by our genes.

p. 43 — [Quote page](https://www.leafyquotes.com/jared-diamond/why-is-sex-fun/our-sex-is-ultimately.md)