The issue is using artificial sweetener in place of sugar, in order to avoid undesirable physiological results of consuming the latter. Please try to keep up with the class.
I don’t understand why you are attempting to equate malfunctions of the body with fertility. Certainly, a runny nose or a sore throat are “natural” responses to many viral and/or bacterial infections, but simply because they are “natural responses”, they are more accurately described as “natural defenses”. “defenses” against the infection.
Fertility, and the “natural responses” to it are not “natural defenses” against anything. So to equate taking a birth control pill to control one’s fertility with taking an aspirin to control a runny nose seems to be a flawed analogy. The two biological processes are inherently different; the fact that they are both “natural” is irrelevant. Again, one is a natural defense, the other is not.
Your 208 spoke of hunger, so I presumed you imagined a pill that cancels hunger. So how is your analogy different if we substitute “sugar” for “dinner”? You supply the answer: sugar has an undesirable physiological effect, and the dinner has not. So is sugar a good or a bad in your scenario?