Talking about Go: Using "he" and "she" for Black and White
Employing some search engine tesujis, I found the page Player Gender on senseis.xmp.net. It clearly states my anecdotal finding, that Sensei's Library uses White=she and Black=he as a convention.

The same convention is used in several influential books, e.g.,   Whole Board Thinking In Joseki by Yi-Lun Yang, Essential Joseki by Rui Naiwei and in the works of Janice Kim (co-author of the Essential Go series).

Note that traditional Yin/Yang symbolism would support the other assignment that is also used by Berlekamp and Wolfe in their book Mathematical Go. From all what I can see, this is the minority position.

My conclusion is that—if one want to use gendered abstract players at all—the White=she and Black=he convention is used in the majority of influential sources and therefore preferable over the opposite convention.