At a recent Tim McGraw concert, a man in the crowd held up a sign that read “Tim Mcgraw will you do our gender reveal?!” McGraw took an envelope from the fan and his pregnant wife, opening it on stage.

“It’s a Tim!” joked the country music star and 57-year-old father of three, revealing that the couple was expecting a boy.

Although they usually don’t involve celebrity guests, gender reveals — a trend in which a couple learns the sex of their unborn child in a public way — are more popular than ever. In 2019, a company called “Poof there it is!” which sells gender reveal party products, including confetti, streamers and balloons, told The Atlantic that it was participating in about 200 gender reveals a day. If Instagram and TikTok video clips are any indication, the trend has only grown since then.

Paradoxically, it has at the same time become trendy to believe that sex itself is a social construct.

Today, those who see themselves at the forefront of social and political progressivism believe that the “gender” being “revealed” at these parties indicates only a sex "assigned at birth” — one that could change based on the baby in question’s eventual self-understanding. For them, blue balloons today represent no barrier to membership on a women’s swim team in 18 years, because sex is mutable, based on feelings and preferences.

Of course, this notion contradicts basic biology. The reality that most........

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