"The ignorant regard this as indecent, but it is not a teaching that encourages lust and leads people to desire. In reality it is the marvellous art of cultivating life. Su Nü miao lun, Ming Dynasty (1368–1644)
So the person who loves loves the loved person's marvelous & superior qualities, so it's the inferior that loves the superior, and the unidirectionality of love is determined by the inferiority and superiority of the parties. The inferior loves the su
