There is no difference. The “broken hymen” referred to here is more properly described as having sex rather than a broken hymen. There is no difference in the state of menstruation whether the hymen is broken or not after having sex, what it was before and what it will be after. The concern about menstruation after sex is mainly due to the fact that there are still many misconceptions about menstruation and the shape of the hymen. Myth #1: A hymen is an intact membrane. We all know about the hymen, but many people don’t really get to know what it looks like. The hymen is not actually a film like cling film, but a layer of connective tissue with holes near the vaginal opening (without holes, menstrual blood can’t come out!). The holes vary in shape and size, and some girls are even born without a hymen, while others have a hymen without holes that are completely closed. Completely closed hymen is relatively rare, usually in the first menstruation, found no blood can not come out, but there is a monthly discomfort symptoms, you need to promptly go to the hospital surgery to break the hymen treatment. Because the hymen itself is in a perforated state, it has no effect on the volume and state of menstruation even if you have sex, even if the hymen is taken off in its entirety. Not to mention the fact that the hymen is very elastic and malleable, so the possibility of tearing is very small, and more likely to be “propped open”. Myth #2: The hymen has a filtering effect. Some people say, “After I had sex, my menstrual blood became darker and there were more blood clots, is it because the filtering effect of the hymen disappeared due to sex.” Of course the answer is wrong! Very wrong! As mentioned earlier, the hymen is perforated and the reproductive organs are not fully developed during early childhood, so the hymen is needed to act as a barrier against bacterial invasion. And as the body develops, the reproductive organs are fully developed and also have immunity, at which point the hymen is no longer needed. In other words, for adult women, the hymen is like the appendix, nothing, nothing! As for feeling changes in menstrual blood, on the one hand, it is psychologically suggestive, scaring oneself, and on the other hand, it is normal that the amount of menstrual blood may increase and decrease with age. And when the menstrual volume is larger, the anticoagulant substances do not have enough time to release to play their role, the blood will clot into clots, and the blood will darken in the clotting process, it will show the effect of clots dark red. To put it plainly, menstrual blood and other parts of the body bleeding is the same, there is no difference in essence, blood clotting will form a dark blood scab, menstrual blood is the same, and there is no sex. Misconception 3: The penis will touch the menstrual bleeding site during sex. The location of menstrual bleeding is the uterus, the site of sexual intercourse is the vagina, the distance is very far, the penis can not touch, do not be confused. The formation of menstruation is after the start of puberty, the endometrium is affected by estrogen and progesterone, and is prepared for the fertilization of an egg, thickening to about 10mm. If there is no fertilized egg, the endometrium is shed due to the loss of estrogen support, and the blood and cervical mucus flowing out of the vagina together with the shed endometrium will form menstruation. During sexual intercourse, the penis will only be in the vagina and will not enter the uterus, so naturally it cannot have any effect on the production of menstrual blood. As for the fictional man of God whose penis can pass through the cervix and enter the uterus, it only exists in fiction, not in reality. Myth 4: Sex can cause vaginal looseness. Finally, some people believe that sex will cause the vagina to become loose and the blood will flow faster as a result. This is really wrong. Not to mention that the amount of menstrual blood produced in the uterus will not change no matter what the vagina becomes, it is impossible that sex will make the vagina looser. The vagina is about 5-8 cm long and about two fingers wide during the week, and the length and width increase after sexual arousal and gradually return after it ends. The vagina will only become lax due to age, pregnancy, disease, etc. Sex does not make the vagina lax. (Unless you keep snapping 24 hours a day ……) So, you really don’t need to be anxious and worried, there is really no difference between menstruation after the membrane breaks and before. The actual fact is that you should pay attention to keep your private parts clean and hygienic, and you should not be in a blood bath!