The Quran has emphatically prohibited sexual intercourse during menstruation:

“Abstain (sexually) from women during menstruation” –2/222

ALLAH (Rabbul-Izzat), the Creator of man, knows best what is beneficial and what is harmful to man. All objects of harm have been forbidden for man because they will cause him difficulty and harship. Sexual intercourse during menstruation falls into thiscategory.

Today, many centuries later, medical science has discovered that the flow of menstruation contains certain toxic matters that could be detrimental if they gain entry into the body of the male or is prevented a clear passage of flow from the body of the female-both of which could easily occur if sexual intercourse takes place during intercourse. It would thus pose a potential threat to both husband and wife. This very act is a major contributing factor towards very painfuland often fatal veneral diseases. In fact, it’s effect is passed on even to the foetus.