When was the phrase ';birds and bees'; first used in the matter of sex education?

My best guess is that it started in the 1800's, after the poet Samuel Coleridge write and published a poem containing the lines:





';All nature seems at work ... The bees are stirring--birds are on the wing ... and I the while, the sole unbusy thing, not honey make, nor pair, nor build, nor sing.';





It's pretty evident Coleridge was referring to sexual acts, and was possibly the first to incorporate both birds and bees in his description of it. I'm sure the phrase ';the birds and the bees'; arose a while after this poem became famous, so I'm guessing in the mid-1800s, since Coleridge died in 1837. After all, Coleridge is also responsible for phrases like ';water, water everywhere - but not a drop to drink'; (even though it's misquoted) and any reference to Xanadu (from Kubla Khan).When was the phrase ';birds and bees'; first used in the matter of sex education?
I think back in the fifties