Die Libido von Frauen nimmt während einer bestimmten Phase des Menstruationszyklus ab. Diese Verringerung des Verlangens könnte eine evolutionäre Funktion haben, indem sie das Infektionsrisiko in einer Zeit senkt, in der das körpereigene Immunsystem auf natürliche Weise unterdrückt ist.
Women’s libido drops during a specific phase of the menstrual cycle
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New research suggests that women experience a distinct decrease in sexual motivation during a specific phase of the menstrual cycle known as the implantation window. This reduction in desire may serve an evolutionary function by lowering the risk of infection during a time when the body’s immune system is naturally suppressed. The study was published in the journal Evolution and Human Behavior.
Scientists initiated this investigation to explore potential functional reasons for fluctuations in sexual desire across the menstrual cycle. Biology dictates that for a pregnancy to be established, a fertilized egg must successfully attach to the lining of the uterus.
This process requires the mother’s immune system to lower its defenses locally within the reproductive tract. This immunosuppression prevents the body from attacking the embryo as if it were a foreign invader.
This necessary biological adjustment creates a period of increased vulnerability. The suppression of immune cells makes the reproductive tract more susceptible to sexually transmitted infections.
Pathogens can enter the uterus more easily during this time. The physiological mechanisms that help sperm reach the egg, such as uterine contractions, can inadvertently transport bacteria or viruses into the upper reproductive tract.
https://www.sciencedirect.com/science/article/pii/S1090513825001102?via%3Dihub
Sounds logical. We’ve known for a long time that the natural cycle affects libido for biological reasons. Since the fertile window is usually a time of hightened libido, it only makes sense other times would lower it if it’s beneficial.
Seems like they made a leap over it simply being a direct consequence of the lowered immunity? As in it doesn’t have to be directly beneficial evolutionary wise, as the lowered immunity already needed to help reproduction anyway. They might just feel well, crappier.