Adonis is the Greek god of beauty and desire. Myths about Adonis tend to focus on his great beauty and strength with him portrayed as a figure who is irrestible to women and envied by men. Today, the name Adonis is used to reference a physically desireable man.
Kinkly explains Adonis
Psychologists reference the "Adonis Complex" when discussing the male obsession with phyiscal strength and appearance.
Bodybuilders refer to the abodominal grooves between the the hipbone and the pubis as the "Adonis belt."
The shoulder-to-waist ratio is referred to as the "Adonis index."