Lust is an emotional or physical response to someone or something, and this emotion is very strong and very passionate. There are lust quotes which discuss sexual responses and those which talk about the mental components involved in this emotion. Many long lasting relationships start with lust but then deepen into love as the couple gets to know each other. Sometimes lust is so strong that you feel an immediate urge to act on your responses, and many consider this a primitive animal reaction that should be tempered in humans. Sometimes lust can lead to obsession if the feeling is not returned by the other person. The word lust is usually used in an erotic sense, and when you experience then you may fantasize about being with that special someone.