What is the bee and the bird theory?

I am an adult but i have never heard of the bird and bee theory when parents are talking about sex to there kids. So what is the theory?What is the bee and the bird theory?
Bees represent fertilization, and pollination is the example of fertilization; usually used in respect to the male ';duty';.





Birds = eggs/ embryo / development.





Most people will call it the birds and the bees, and some parents may use these examples in nature to explain a little about what's going on during copulation, etc. In most cases now, I think people only use it as a euphenism and don't actually discuss or use these examples, although they're excellent.What is the bee and the bird theory?
There is no specific theory: ';the birds and the bees'; is just a euphemistic way to refer to the facts of life, or sex/reproduction. As in, ';I had to tell my son about the birds and the bees.';
ND DVM is right, it's just a way of saying, ';having sex'; in a polite way that doesn't embarass anyone.

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