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frogman80
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Right… vomiting for with wrong reasons is the evil… not the action of vomiting itself. I was imagining one who overindulges… a glutton who then vomits so that they can continue to eat more, or prevent weight gain.A good, clear analogy. If I may make an observation however:
Both of those actions have an element of dependence on circumstances in determining whether they are sinful or not. For example, while we are required to fast on such days, those who are young, or very ill, etc., are not required to fast. Thus “eating on a fast day” (as a whole) is not intrinsically sinful.
And, with vomiting, suppose we ate some food and then realized that it had been laced with some sort of poison. It would be morally justifiable (even necessary?) to vomit in order to expel the poison. It is not evil in that case by virtue of double-effect: the intent is not to expel the food but the poison; the food is vomited as a secondary effect. Thus, vomiting is not intrinsically sinful either, since it is an established natural, biological method for dealing with toxic stomach contents.
Post to follow.
That said… one cannot separate the use of a contraceptive for the purposes of preventing disease with the consequence of artificially preventing birth.