The actual technical health reason for asking for this information is to spot when teen girls are training too hard and throwing off their cycles.

We know this isn't what DeSantis would do with it, but that's why the information was collected in the first place.

Of course, this would catch intersex girls, girls with PCOS, etc, in the web too, but I think that's a feature, not a bug. Given the only thing these people value women for...