That's because:
1. Women don't really matter, they aren't really "playing the game", they are the objects acted upon in the game, so there's need to go over board categorizing them.
2. It would be irrelevant, women can get sex quite easily regardless of race or "looks tier", but a man's race affects his effectiveness in getting laid to a high degree, which is why we categorize all the high tier males of each race, because Chang will never get laid as easily as Chad, but some random white woman and a random asian woman (not even high tier in looks) can get laid easily, there's no point in categorizing the group because there's little to no variation in success rates, basically every woman just gets laid without trying, there's no difference between a "stacey" and a "shaniqua", so it makes sense to just use stacey for all of them.