Since all of the game's guards are male (barring the unused female Moonraker Elite), there will always be more male characters in a mission than female, and it's likely only a single female head is loaded to reduce the amount of texture memory used.
Since all of the game's guards are male (barring the unused female Moonraker Elite), there will always be more male characters in a mission than female, and it's likely only a single female head is loaded to reduce the amount of texture memory used.