Try it this way.
Everyone agrees that binging and purging is wrong. But few people could articulate the reason.
The reason is because the primary purpose of eating is nutrition. A concomitant aspect of eating is pleasure.
When a person eats a delicious meal, and then induces vomiting, so he can eat more good tasting food, he is elevating pleasure over the primary purpose of eating.
Not surprisingly, this practice can relate in ill health.
This is a perfect analogy to artificial means of induced sterility.
People who use artificial means of induced sterility, whether temporary or permanent, are elevating the pleasurable aspects of intercourse over the primary purpose of the act.
Besides risking one's health, this practice is associated with many other social ills, such as disregard for the well-being of the woman, that were outlined many decades ago.
Let them first consider how easily this course of action could open wide the way for marital infidelity and a general lowering of moral standards. Not much experience is needed to be fully aware of human weakness and to understand that human beings—and especially the young, who are so exposed to temptation—need incentives to keep the moral law, and it is an evil thing to make it easy for them to break that law. Another effect that gives cause for alarm is that a man who grows accustomed to the use of contraceptive methods may forget the reverence due to a woman, and, disregarding her physical and emotional equilibrium, reduce her to being a mere instrument for the satisfaction of his own desires, no longer considering her as his partner whom he should surround with care and affection.Finally, careful consideration should be given to the danger of this power passing into the hands of those public authorities who care little for the precepts of the moral law. Who will blame a government which in its attempt to resolve the problems affecting an entire country resorts to the same measures as are regarded as lawful by married people in the solution of a particular family difficulty? Who will prevent public authorities from favoring those contraceptive methods which they consider more effective?
Nonsense. The analogy does not even come close to being accurate.
I understand that the roman church teaches against contraception. Since we do not live in a country controlled by the roman church others have the right to disagree. Moreover there are important reasons to use ‘birth control’... I am not going to argue about this with anyone.