Whether any pleasure is not natural?

❌ Objection 1 : It would seem that no pleasure is not natural. For pleasure is to the emotions of the soul what repose is to bodies. But the appetite of a natural body does not repose save in a connatural place. Neither, therefore, can the repose of the animal appetite, which is pleasure, be elsewhere than in something connatural. Therefore no pleasure is non-natural.

❌ Objection 2 : Further, what is against nature is violent. But "whatever is violent causes grief" (Metaph. v, 5). Therefore nothing which is unnatural can give pleasure.

❌ Objection 3 : Further, the fact of being established in one's own nature, if perceived, gives rise to pleasure, as is evident from the Philosopher's definition quoted above (Article [1]). But it is natural to every thing to be established in its nature; because natural movement tends to a natural end. Therefore every pleasure is natural.