“More sex is good for making babies” sounds like a load of crap. Apart from IVF and other special means, sex is almost the only way to make a baby, so of course more sex is good for making a baby. But when you get down to the nitty-gritty of it, it becomes a little less natural. The birth of a fertilized egg requires not only sperm but also an egg. If you’re ovulating, you might be able to increase the likelihood of conception by having more sex. But the sperm in the non-ovulatory period and can not see the egg, popping is not a kind of useless? The answer is no. Recently, the United States Indiana University Bloomington (University of Indiana, Bloomington) researchers Tierney Lorenz (Tierney Lorenz) and others in the “Fertility and Sterility” (Fertility and Sterility) and “Physiology and Behavior” (Physiology and Behavior). (Tierney Lorenz and others published a paper in each of the academic journals Fertility and Sterility and Physiology and Behavior answering the question of why couples who want to make a baby try to have sex even when they’re not ovulating, and the reason for this has to do with the immune system. What does pregnancy have to do with the immune system? Wait, pregnancy is a reproductive system job, what does it have to do with the immune system? Can the immune system make people infertile? Unfortunately, we humans are a paradoxical creature …… As an effective body defense mechanism, the immune system recognizes and reacts to foreign objects (such as viruses or parasites) that do not belong to us. In terms of maintaining health, the immune system activated by foreign objects mostly acts as a defense against foreign invaders. When considering pregnancy, however, the immune system seems to be at a disadvantage – for the immune system of the conceiving partner, the sperm is undoubtedly a foreign object that does not belong to it, and would normally be eliminated. But as we know, many times the sperm is clearly not eliminated (or there wouldn’t be me who codes and you who reads). It’s true that some members of the immune system will view sperm or fertilized eggs as foreign and initiate an immune response, but others will give them a wide berth. For example, of the body’s “helper T cells” (Th cells, those that activate other immune cells, also known as helper T cells), type 1 helper T cells trigger an immune response that may have an impact on conception, while type 2 helper T cells facilitate the fertilized egg’s implantation. Similarly, the antibody immunoglobulin A (IgA) in the human body affects sperm activity and even attacks sperm directly, whereas another antibody, immunoglobulin G (IgG), has no such properties. Interestingly, it has been found that the proportions of these members of the immune system change cyclically around the time of ovulation. During the follicular phase before ovulation, class 1 helper T cells and immunoglobulin A make up the major portion; while during the luteal phase after ovulation, class 2 helper T cells and immunoglobulin G become the mainstay. In other words, our immune system still seems to be very knowledgeable when it comes to promoting conception. The two types of Th cells and antibodies show cyclic changes during each menstrual cycle. What does this have to do with fapping? Back to this study from Indiana University. Since the immune system produces a specific cyclical change in order to facilitate conception, would regular fapping, as an indication that one is trying to conceive, in turn create a positive feedback that raises the levels of the 2 types of helper T cells and immunoglobulin G? To answer these questions, Tierney et al. conducted research at Indiana Hospital. They targeted women with biological cycles of approximately 26-34 days and divided them into a “frequent fapping” group and an “infrequent fapping” group. In the “regular” group, the women had sex at least once a week and did not use hormonal birth control. The control group, the “infrequent” group, had not had sex for at least four months. Using these criteria, they selected more than 30 subjects. By analyzing the physiological data of these subjects, Tierney et al. found that before ovulation, the women who had sex frequently had higher levels of class 1 helper T cells and immunoglobulin A. During the ovulation-luteal phase, they also had more class 2 helper T cells and immunoglobulin G than the control group. pronounced, and that this change, especially the rise in the number of class 2 helper T cells and immunoglobulin G after ovulation, is favorable for conception. Tierney et al. proposed a number of hypotheses to answer the question, “Why does sex promote cyclic changes in the immune system? First, women who have sex more frequently may have higher estrogen levels and produce more prolactin after orgasm, hormones that may affect the immune system; second, microorganisms or semen from sexual partners may also stimulate the immune system. These are all potential and yet to be proven factors. Instead of stressing about calculating ovulation, it may be better to relax and make love whenever you want, which may instead contribute to a successful baby-making process. To summarize, Tierney et al. found that frequent fapping stimulates the immune system, causing it to produce more pronounced cyclical changes before and after a woman’s ovulation, which are beneficial to a woman’s conception. This finding answers the question of whether fapping during non-ovulatory periods helps conception from a new perspective, and suggests that the immune system is not a passive defense system as we previously thought. In fact, human behavior can have a much broader impact on the immune system.