Ok, so to get mostly girl video to play (couldn't manage to get only girl videos to play), I had to do the following (click the computer in your house or office, click settings menu folder, click modify settings folder).
Scroll down to video helper settings:
leave/turn Variety setting off (should say 'Enable' and have a green check if disabled).
Enable Always use girl vids setting.
Enable, always include generic videos setting.
Set all sliders under Generic Videos setting to 1.
If you have Variety and Generic turned off, it still seems to prioritize generic videos even if the girl has a video to use. if you leave Generic videos setting disabled, but modify the match/webm settings, it either only plays generic videos or plays NO videos at all (especially girl creampie videos).
Set this way, if a certain girl video plays a couple times, generic videos start playing anyway, but 8 out of 10 videos played that have girl video options play the girl video.