And here I was hoping someone might actually answer ABC's request. I was interested in seeing what similar chicks other people recommended. Instead, everyone dumped on him for something which wasn't really relevant to his request. I suppose it's up to me to offer him some names --
Check out Jordan Capri. She's not 18 anymore, but you can certainly find clips of her when she was. They're not really hardcore, but she's still one of the hottest things out there. Furthermore, there are many pornstars who started out almost immediately after turning 18. Too many to list, but I'd recommend Keri Sable.