I think it all depends on what one is focused on in life at the time. In the past I have had "friends with benefits" and "booty calls". If you don't have time for a full on relationship or there are other demands on your life then having someone to connect with every now and then helps to give your life some balance. It doesn't mean a person wants it this way for the rest of their life it just may be perfect for them right now.
Sex is an "urge" much like hunger for a particular snack or thirst for a particular beverage. People have sexual urges whether they are in loving relationships or not. Some people choose to (fast) until they find love and others choose to (satisfy) their urges as they arise. Whatever works for (you) is fine. Life is a personal journey.
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