In current American usage, the term “the birds and the bees” is a euphemism for sex. Please don’t ask me why, I didn’t invent the language here, so I have no earthly idea. Since birds and bees are unable to mate (procreate) with each other, the mystery only continues to confuse me (and others, I’m sure). After writing all of that, I’m still unclear on the background or history of the expression. However, it does represent the sexual act, especially when parents talk around other non-adults.