Seductiveness stems from the impossibility to identify.
Impossibility to identify alone isn’t sufficient and can wield extremes.
Couple it with a threatening behavior (pressuring insecurities etc) and you become terrifiying.
Couple it with a playful attitude and you become a mystery.
Couple it with intense conviction and you become a lunatic.
In any case you are ungraspable.
This principle can be reversed.