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back 2 topic(from wikipedia)
"The birds and the bees" (sometimes expanded to "the birds, the
bees and the butterflies" or "the birds, the bees, the flowers, and
the trees") is a commonly used phrase (which has become somewhat of
a cliché) which refers to clumsy or inept attempts at sex education
for children or adolescents, such as the use of euphemisms or
symbology to describe sexual behavior or body parts. A discussion
about "the birds and the bees" may therefore involve references to
nature (ie. animals and plants) without actually describing human
biology or providing any useful insight.
The phrase is said to have its origins in a folk tale, whose exact
source is unknown, that reportedly became popular in Southern
Africa (probably Namibia) around the turn of the last century. It
tells the story of a colony of bee-eater (Merops pusillus) birds
laying their eggs after a meal of honeybees.