As the father of two twenty-something year old daughters who "insist on their right to be sexually active adults", I will tell you that you are using the wrong words. Most girls today are simply sluts. They give it away to anyone who strikes their fancy. It's about as special as washing their hands, IMHO.

Whores on the other hand sell it. They charge a fixed price for a particular act or period of time. Intercourse (vaginal) with a 90 minute time limit will go for $500 and up. Longer periods of time, dinner dates, attending social functions as a 'girlfriend' all cost more. But sometimes the whore works out far cheaper in the long run than the slut that turns up preggers!