Birds and the bees

We all know “the birds and the bees” is another term for sex, but what does it all mean? What could birds and bees (things that seemingly have hardly any relation) have to do with sex? They certainly don’t have sex with each other. You don’t see any super bee-birds flying around eating seeds and making honey. Could it possibly have something to do with bees stinging? When they sting they “penetrate” whatever they are stinging… but even so that still doesn’t explain the birds half of it. It probably isn’t very pleasant when birds and bees get together… perhaps the term was created by someone that doesn’t enjoy sex? In the end, I have no real solid explanation that can make sense of this.