the birds and the bees

/DH AH0 B ER0 D Z AH0 N D DH AH0 B IY0 Z/
noun
  1. 1

    (Informal education about) sex.

    โ€œWe learned about birds and bees back in school.โ€

Source: https://en.wiktionary.org/wiki/birds%20and%20bees, https://en.wiktionary.org/wiki/the%20birds%20and%20the%20bees