Cupids they were called. Descendants of the goddess Venus... The goddess of love.
This phenomenal individuals could only be spotted in royal bloods and Noble families. Hence, they were known as high statuted and very rare to be seen or noted. Cupids are said to be beautiful, alluring and elegant males just like their predecessor. Quite coquettish in behavior.
In a noble family. Or a Royal blooded family. The chances of giving birth to a Cupid usually came right after the third child. If perse the fourth child was a girl then there would no Cupid until a male child was born.
Cupids as they were called were hermaphrodite beings. Although born male, they end up possessing two reproductive organs after a change called... Blooming.
The Blooming of a Cupid was the possession of the second organ he wasn't giving birth to. It could come early. It could come late. One thing was that the latter won't be aware until he notices weird signs.