What's the type where you know you shouldn't want to breed with, but everytime you see a girl like this your lizard brain just kicks into overdrive and you can't help yourself?
For me, it's the skinny, skanky looking goth/grunge/alt chicks. Girls who look like they used to be heavy into scene or emo when they were teens, but matured out of it into a sluttier, less innocent look, that still let's you know they're a freak, but they're more self aware and a lot more open. Piercings everywhere, tats covering most of the body, dyed and unique hair styles, heavy make up, revealing and bratty looking clothing (especially crop tops). All of that grungy e-thot shit that makes a girl look like a made up doll-whore. (Pic related)
This all goes out the window if they're above 125 lbs. (I hate fat chicks so much) or if they're just base ugly to begin with. Other than that, I'm a complete sucker for all of it. Women wearing shinny and colorful things to attract men has been a known plot for thousands of years and I still am falling for it.