What is the philosophy behind the prohibition of sexual intercourse during menstruation?

Copulating with women in this state, in addition to being revolting, also entails great harm and this is a fact that has also been corroborated by present-day medical studies. Some of the harms are: Possible occurrence of infertility in the man and the woman, creation of an environment conducive to the development of microbes of sexual diseases such as syphilis and gonorrhoea, inflammation of the female genitals, entry of the menstrual matter – replete with microbes from within the body – into the male reproductive organ and several other detriments, which are mentioned in books of medicine. It is for this reason that doctors prohibit sexual intercourse with such women.

The bleeding during menstruation is related to the congestion of the uterine vessels and the flaking of its mucus; the ovaries too are in tune with these vessels in this act of congestion.

Almost contemporaneous to menstruation the female ovule passes through the fallopian tube and enters the uterus so that, in the eventuality of the arrival of the male sperm, the two, in collaboration with each other, can form the embryo.

Initially, the abovementioned blood discharge is colourless and irregular but soon becomes red and regular till, near its conclusion, it once again becomes light in colour and slips into irregularity.

Basically, the blood that is discharged every month during menstruation is the blood that gathers in the internal uterine vessels for the presumptive nourishment of the embryo. We do know that every month a woman’s uterus produces one ovule and simultaneous to this the internal vessels, gearing themselves up for the purpose of nourishing the embryo, become replete with blood.

If the ovule, having entered into the womb after having passed through the fallopian tube, encounters the male spermatozoid, an embryo is formed and the blood present in the vessels is utilized for its nourishment. But if not, the blood, as a result of flaking of the womb’s mucus and the rupturing of the walls of the vessels, gets discharged from the womb in the form of menses.

Thus, it becomes plainly apparent as to why copulation in such a state is detrimental and prohibited. The womb, during this discharge, does not possess any kind of natural preparedness to accept the spermatozoid and thus comes to suffer harm.