It depends.
If he wants sex and she wants sex I guess than that it is perfectly normal thing that they have sex.
But generally speaking, something that is easy aka doesn't require effort isn't very interesting. Girls that are "hard to get" generally are more interesting because they require effort. Men that are more passive in nature, tend to seek these women, since they feel moved by them. Key is timing and real drive on both sides. What is the true motif to play hard or easy is the key question.