Some players do it solely for aesthetic purposes. And there are players that take in the possible tactical advantage. I don't know if it's true for this game, but typically female characters are built smaller and thinner than male characters. Character design can alter the hitboxes to be smaller and more difficult to hit. Even if all characters hitboxes were exactly the same, the appearance of the character itself can be a factor ala mind games. For me, it's aesthetic. But my main is a male exo hunter soooo.. Yea..