The Cambridge Dictionary describes lust as a very strong sexual desire. It’s about sexual gratification that stems from our innate desire to reproduce — the purest form of physical attraction.
Lust is unique because there is no requirement to know the person, nor is there always an intent to pursue a relationship. That said, while you don’t have to be romantically attracted or emotionally attached to lust for someone, it is often the first stage in the process. In some cases, you may be repulsed by a person’s personality, yet feel tremendous physical desire for them.
Think about your own life. There is likely someone who you don’t know well or don’t like personally, and yet they still make your blood divert. They could be arrogant, selfish, and self-absorbed, but that doesn’t prevent you from feeling physical attraction.