(2) Though adultery (or fornication) has always been accepted as an evil, opinion has differed as to whether it is legally a punishable offense or not, and this is where Islam differs from other religions and systems of law. Social systems which have been akin to human nature have always considered illicit intercourse between man and woman a serious crime and prescribed severe punishments for it. But with the deterioration in moral standards, this morality grew weaker and weaker and the attitude towards this crime became more and more tolerant.

(1) The common meaning of zina which everyone knows is sexual intercourse between a man and a woman without the legal relationship of husband and wife existing between them. There has been complete unanimity of view among all the social systems from the earliest times to this day that this act is morally wicked, religiously sinful and socially evil and objectionable, and there has been no dissenting voice except from those stray individuals who have subordinated their moral sense to their lust, or who in their misguided notions try to be original and philosophical in their approach. The universal unanimity of view in this respect is due to the fact that man by nature abhors zina. In fact, the future of human race and civilization depends on this that the relationship between the husband and wife should be built upon the basis of an enduring and everlasting bond of fidelity, which should not only be fully recognized in the social life but should also be guaranteed by the existing social structure. Without this the human race cannot survive. This is because the human child requires years of tender care and training for survival and development and a woman alone cannot bear the burden without the cooperation of the man who became the cause of the birth of the child. Similarly human civilization itself is the product of the corporate life of a man and a woman, their setting up a home, bringing up a family, and establishing mutual relationships and inter-connections between families. If men and women were to lose sight of this essential fact, that is, the establishment of a home and raising a family, and were to meet freely just for pleasure and lust, the entire structure of human society would crumble. In fact, the very foundations on which the structure of human civilization and culture has been built will topple down and the whole basis of the concept of a social life will disappear. It is for these reasons that free mixing of men and women, without any recognized and stable bonds of fidelity, is abhorrent to human nature, and it is for this reason that in every age zina has been considered as a moral evil and, in religious terminology, a grave sin. Accordingly, the social systems in every age recognized and adopted the institution of marriage and also adopted preventive measures against adultery or fornication. The forms of the measures adopted in this direction have, however, differed under different social, cultural and religious systems. This difference has been the result of the realization of the disastrous effects of adultery (or fornication) in varying degrees: some societies have considered it to be more heinous than others, and some have conceived it clearly and some others not so clearly and confused it with other problems.

There are various legal, moral and historical aspects of this problem which need explanation, for if these are not clarified in detail, the modern man will find it difficult to understand the divine law concerning it. Accordingly, we shall discuss the various aspects of the problem below.