When you pick up a bar of soap, the first thing you probably do is hold it to your nose and sniff. The packaging, color, and other visuals may attract you, but it's likely the scent that captures you. Some people choose unscented products all or some of the time. More, however, choose soap because they like the scent. You can scent your soaps in many ways. Two of the easiest, however, are to add essential oils or fragrance oils. Here's what you need to know about fragranceoils.