They are the products of desire: sexual, yes, but more importantly (in the age of contraception, at least) they come from the desire to recur. Give me the chance to repeat myself. Give me a life lived again, and bigger. Give me a self to take care of, and better. Again, please, again! We’re wired, it’s said, to want repeating. To want seed and soil, egg and shell, or so it’s said.