Hi daddysugar50, welcome to Perutops, i hope u've a great travel.
About ur question Do u refer to Downtown Lima? if ur answer is yes so the prices r cheap, more or less 10 or 25 bucks (30 - 70 soles) How much budget r u considering or reserving to one girl? In the downtown there r two brothels, la Nene and the more touristic Cucardas, this last is less cheap but, money-wise, the girls r cuter and besides peruvian ladies there r girls from Ecuador Colombia and Venezuela. Nevertheless u've 2 go in taxi, cause the near neighborhood is dangerous. Also there are girls in hostels, but it can be a bit dangerous and the girls could be not so pretty.
Usually the "kines" (euphemism to slut) are in other sections outside downtown as Miraflores and Lince, in hostels and saunas.
But if u are looking for street girls in the downtown itself, i suggest u caution, even i'd say that don't go with a downtown street girl, no way. They could be, and this is common, thiefs. U could end with no sex, no money, no cell phone, etcetera. And they work late, 10pm.
Regards.