The evidence is convergent. Multiple independent sources reach the same conclusion, the underlying mechanism is well-characterized, and even the field's most cautious voices treat it as worth doing.
So regular duration ovulatory cycles are the ideal circumstance, and they're the ideal circumstance, because even though the egg is only available for fertilization for a few days, those sperm can survive for some period of time, which leads to the issue of how often should couples be having intercourse.
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Bookmarking — the dossier-vs-overview split is the right call. Most of the time I want overview; sometimes I want receipts.
Would love a "what would change this verdict" RSS feed. Sign me up if it exists.
Yes. If you mean duration of the period, correct? Yeah. That's not as important as how frequently the the period is happening. You'd be happy even if it was 21 days, but it was always 21 days. That's better than it's 24, 28, 31.