text: I think I agree with your direction here, but I would rephrase the idea in the first sentence: The strict teleology of sexuality, defining it as procreation, is Aristotelian; and later Platonists certainly accepted Aristotle as one of their own, aside from his own extraordinary emphases. And the Stoics learned a lot from him too. But at what point the assertion that the end of sexuality is procreation became an ethical norm, I don't know. It certainly sounds like something the Stoics might have said. We should note in this connexion that homophobia became a commonplace in the later empire; e.g., as much as Plotinus admired Plato, he was embarrassed by Plato's positive attitude toward homosexuality.
  
  As for the "sense of the (Catholic) faithful," it's true that the cultures of Catholic nations have more often than not done much to celebrate the joys of non-procreative sexuality, at least of opposite-sex partners. It's less clear that they founded a robust church doctrine on those joys.