Noun
birds and bees pl (plural only)
(euphemistic, idiomatic) (Informal education about) sex.
We learned about birds and bees back in school.
Synonym: facts of life
Look, I guess it's natural, you're teenagers, its springtime, everyone's thoughts are turning to birds and bees and caterpillars and moths..... - Iggy. James Patterson
We think we are smart because we have been flying for about sixty years. Birds and bees and butterflies have been flying for hundreds of thousands of years. Charles Kettering
Bonnie J. Rough, the author of Beyond Birds and Bees: Bringing Home a New Message to Our Kids About Sex, Love, and Equality, agrees. Source: Internet