I am SO tired of this trope. It may indeed be the case that we can’t justify a priori via philosophical lucubrations that we arrive at the truth abou… - Jerry Coyne

I continue to be amazed at how much dust is stirred up by simply asserting the biological observation that, in animals and vacular plants, there are but two sexes, and those sexes are defined by the reproductive equipment they have. Males are “designed” (I’m speaking teleologically: “evolved” is what I mean) to make small, mobile gametes, and females to make big immobile ones. For decades this has been uncontroversial: A truth universally acknowledged, to paraphrase Jane Austen.
Now, however, for reasons known best to themselves, a small but vocal group of ideologues is denying the sex binary. In my coauthored paper coming out in late June, we hazard some guesses, but those of you following the controversy probably realize that it involves trying to impose one’s ideological views onto nature.
This doesn’t work so easily with the sex binary, as even nonscientists can observe it with their own eyes. The result is that deniers of that binary, such as Agustín Fuentes and Laura Helmuth (editor of Scientific American who’s published several pieces denying a sex binary), face considerable pushback from both scientists—who work with male and female organisms—and “regular” people, who have eyes to see and neurons to analyze.

No, we don’t have faith in reason and science in the same way as “Cru” members have faith in God. I see “faith” according to Walter Kaufmann’s definition: strong belief in propositions for which there is insufficient evidence to command the assent of every reasonable person. We have confidence in science because it has led us to provisional truths—it works. Cru doesn’t even know if there’s any God, or, if there is a divine presence, that it’s the Abrahamic god rather than the Hindu god, Yahweh, or Wotan. And we use reason in the same way: it leads us to truth. Revelation, dogma, and authority do not, for if they did there would be only one religion rather than thousands with their disparate and often conflicting doctrines.

But some of our moral behaviors, if not sentiments, almost certainly evolved. Evidence for that comes from finding parallels between the behavior of our own species and that of our relatives.