Yes and no.
Like radeng said, it depends on the girl.
Obviously it's impossible to say exactly what type of girl or how many women (in terms of percentage of the population) are "sleeping around".
If you're looking for a stable, ethically and morally upright woman with strong values and chaste attitude, then you're more likely to find women on that side of the spectrum if they're devoutly religious, lower sex drive, lower testosterone.
They usually don't party, they don't drink often, they don't do drugs, they aren't risk takers, they aren't thrill seekers. Basically, they tend to be homebody types or very low energy and in a way, "boring" types because they don't seek a lot of stimulation and they are generally content and fulfilled with one person. And honestly, the majority of women tend to fall closer to this side of the "spectrum", if you will, in my experience.
What happens is that most men, especially going through college and living the night life, their perception of women is skewed because they consistently meet women who seek out stimulation and excitement in various forms. These women tend to be more flirtatious, social, outgoing, risk-taking, alcohol consuming, drug using... these aren't absolute truths, but general trends and tendencies. You're going to find more of these types of women at clubs, bars and lounges than you would at... the library or your school campus.
If you spend an inordinate amount of time at these places... guess what. You'll end up meeting more and more women like this and you'll come to believe that all women are a certain way. That's why the club scene in particular can get you extremely jaded. So if you're looking for a woman who doesn't sleep around, your chances of finding a less sexually promiscuous woman is connected to where and when you meet her and the type of lifestyle she is into.