Recently, the Supreme Court heard arguments in two cases about the validity of state laws banning boys from girls sports, West Virginia v. B.P.J. and Little v. Hecox.

The lawyers on the trans side bizarrely claimed that puberty blockers erase whatever athletic advantage men who say they are women may have. That’s crazy enough—as the attorneys for the young women pointed out, the male athletic advantage doesn’t begin at puberty, but begins as early as 5 or 6 years of age.

But there is something even crazier here, for the presumption seems to be that men have a right to compete in women’s sports unless they have a biological advantage, just because they think they are really women. No. They aren’t what they think they are, and they have no such right.

To say what ought to be obvious: Men and women are different.

Moreover, women want and need some girls-only activities, and men want and need some boys-only activities. This would be true even if the two sexes were equally big, fast, and strong. We don’t have to pretend that they are the same,........

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