<Li> American indie pop musical duo from Los Angeles - The Bird and the Bee . </Li> <Li> Many songs feature an extended version of this phrase; "the birds and the bees and the flowers and the trees". </Li> <Li> The song "Hummingbird Heartbeat" by Katy Perry also states "this is the story of the birds and the bees", referring to sexual intercourse . </Li> <Li> The American classic song "Let's Fall in Love" contains the suggestive lyric, "Birds do it . Bees do it ." </Li>

Where does phrase birds and bees come from