I stand corrected. It is interesting that ovulation does not normally ouccur just before menstration. This must be due to the fact the humans are very sexual beings and since they pretty much have sex any time of the month ovulation would move to the time they had sex the most(thoeretically). And since for thousands of years people avioded having sex during thier period, only women who ovulated at another time would concive. Hence women who only ovulated at a time other than thier period would become the majority.

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