l exhaustion would take over, and that would stop the activity from being pleasurable. Although it is the initial pleasure that is derived from any activity that continues the quest for it.The next discussion begins with the idea that pleasures differ in kind. He then reiterates that the species of pleasures seem to be different. Since he has established that and established that pleasure completes an activity, it would then seem the next step to say that: Activities that differ in species are also completed by things that differ in species. Activities of thought differ in species from activities of the faculties of perception, and so do these from each other; so also, then, do the pleasures that complete them (1175a25-30). When an activity that has a proper pleasure that is present it will improve their proper function. If, for example, the proper pleasure of (according to some religions) sexual intercourse is procreation, then the pleasure received from the act is the proper pleasure. The activity has a formal pleasure in that it is going to create life, and the people involved are seeking that end. Because there is physical pleasure that is involved as, although completely unnecessary for procreation, the act becomes best by this.Alien pleasure, conversely, does the opposite. If a proper pleasure makes an activity more exact, longer and better, while an alien pleasure damages it, clearly the two pleasures differ widely(1175b15). Using the same example, as with the proper pleasures case for sexual intercourse for procreation, using birth control of any sort, or homosexual sex would be an alien pleasure since it stops the proper function of the activity. The formal pleasure is gone because there is no desire for a child, but the alien, physical pleasure remains and becomes the focus of the activity. Alien pleasure is not the same as proper pain, though the effects are similar in destroying an activity.So then the question i...
