It is essential to refrain from having intercourse with a menstruating women because doing so leads to an increase in the flow of menstrual blood, because the veins of the uterus are congested and prone to rupture, and get damaged easily; and the wall of the vagina is also susceptible to injury, so the likelihood of inflammation is increased, which leads to inflammation in the uterus and in the man’s penis, because of the irritation that occurs during intercourse. Having intercourse with a menstruating woman may also be off-putting to both the man and his wife, because of the presence and smell of blood, which may make the man impotent The lining of the uterus is shed during menstruation, and the uterus is scarred as a result, just like when the skin is flayed. So it is vulnerable to bacteria and the introduction of the bacteria that are to be found at the tip of the penis poses a great danger to the uterus. Hence the penetration of the penis into the vagina at the time of menstruation is no more than the introduction of germs at a time when the body is unable to fight them. The spread of infection to the fallopian tubes, which may then become blocked, which in turn may lead to infertility or ectopic pregnancy, which is the most dangerous kind of pregnancy. The spread of infection to the urethra, bladder and kidneys; diseases of the urinary tract are usually serious and chronic. ncrease of germs in the menstrual blood, especially gonorrhea germs.