Now, sex is the first thing we notice about someone, and the last thing we forget.
It is true. When describing someone we've met for the first time, we never struggle to remember whether the person was a man or a woman (although people are trying to make it difficult these days.) We might struggle over the name, eye color, height, weight (except in a general sense), but we don't forget whether they are male or female. It's hard to hide.
Yet the confusion people are having describing their own sex these days! Read Anthony Esolen's take.
Oremus pro invicem!