the birds and the beesif you tell someone, especially a child, about the birds and the bees, you tell them about sex
[TahlilGaran] Dictionary of Contemporary English ▲
birds and the bees (the){n. phr.}, {informal} The facts we should know about our birth.
At various ages, in response to questions, a child can be told about the birds and the bees. [TahlilGaran] English Idioms Dictionary ▲