Definição e Significado de "the birds and (the|) bees"

What is the origin of the idiom "the birds and the bees" and when to use it?

The origin of the idiom "the birds and the bees" can be traced back to ancient Greek mythology. In particular, it references the story of Zeus transforming himself into a swan to seduce Leda, resulting in the birth of Helen of Troy. Over time, the phrase has evolved to serve as a euphemism for explaining human reproduction and sexual matters, especially to children.