Adonis is traditionally the god of "good looks" in men, but in Romantic Dynamics, the term also refers to the charm and enjoyment of "the boy in the man" - meaning a youthful, playful attitude, not just good looks.
Smyrna, daughter of Theias, king of Assyria, conceives a child by him through trickery. Theias finds out and is determined to kill her, when the gods intervene and turn her into a myrrh tree.
Nine months later, the baby Adonis comes out of the tree. Aphrodite fell in love with the beautiful young man, and sheltered Adonis as a new-born baby, leaving him with Persephone, who was also taken by Adonis' good looks and refused to give him back to Aphrodite.
The dispute between the two goddesses was settled by Zeus, who decided that Adonis was to spend one-third of every year with each goddess and the last third wherever he chose. He chose to spend two-thirds of the year with Aphrodite.
Adonis was killed by a wild boar, said to have been sent by Artemis, jealous of Adonis' hunting skills, or Ares, who was jealous of her love for Adonis.
Aphrodite came to Adonis when she heard his groans and he died in her arms.
One thinks of how lovers may call each other, "baby," as nicknames, and how the endearing charm is of a son to a mother, recapitulated in adult life when couples fall in love.