Another slut question?

I'm confused about women's opinions with regard to a woman (lets say a single woman) that wants to enjoy casual . Is she a slut because she doesn't want to waste time with courtship and establishing a relationship? What if she doesn't see a long term relationship with this person, but he is an available "hot body" at that point in time? Why do you think you are doing a guy a favour if you agree to have with him? Isn't it something you are enjoying as well???