Two Things:
1) I think this kind of thing just goes to show how poor an understanding of the human body functions (both male and female) we truly have, which is why I generally don't trust modern medicine. If you're only having sex when the woman's body doesn't have an egg ready, can we really say that the autonomous nervous system isn't "smart" enough to compensate for that? The purpose of the reproductive organs is, after all, to reproduce. Stupid Catholic Rhythm Method (no offense to anyone, but I am a recovering Cathoholic -- Pope-free since 1994!)
2) It isn't the ovulation that overstresses the woman's body and causes what has become known as PMS. It's the process of getting rid of the stuff needed to get pregnant (uterine lining, extra fluid, etc) that causes PMS. That usually only happens once a month.
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