Is sex the end of the world? : Mutual physical attraction is common. If both are willing, we are not going to sit in value judgment and tell whether sex thereafter is right or wrong. The decision depends on the people who are involved. But is it possible to be serious about a person who thinks of nothing beyond sex? It may and may not be, depending on what kind of person you are. Since you already know what you want from life, you must know how the other person feels.