For example, young widows who were still maidens or whose husbands died without leaving behind heirs were permitted in some places in the past to approach other men in their families or even god-men to bear children.
Hinduism draws a clear distinction between normal sexual desire and lust.
The worlds cannot exist or continue without sexual desire, and God cannot ensure the order and regularity of his creation unless beings procreate and support the gods in heaven.
Since it is central to our existence, fulfillment of sexual desire is considered in Hinduism one of the chief aims of human life, without which a householder cannot attain the fourth aim, namely liberation, or ensure his existence or that of his ancestors in the ancestral heaven.
by Jayaram VThis article presents a historical analysis of premarital sex, caste distinctions, and sexual mores of ancient Hindu communities in the context of changing traditional values among the youth and the new social challenges that may impact Hindu society. Hence it may be revised further if research brings out new information.
The problem with Hinduism is that you can argue from every angle and support different standpoints, depending upon how you may view them.
Even the Upanishads hint at the faint connection between the supreme bliss of Brahman and the bliss arising from sexual union, which is a billion times less intense, but all the same divine.
For example, as we learned from Greek sources that unmarried women were often auctioned off by their fathers and sold into slavery or bonded labor.
Hence, they vehemently advise men to curtail the freedom of their women and keep them within bounds so that they will not distract men from performing their obligatory duties or succumb to temptations and cause the intermixture of castes and decline of their families.
Sexual mores of ancient India were determined largely by social structure, caste rules, and the caste status of the individuals.
The Hindu law books are consistent in using this interpretation as the standard to determine the lawfulness or unlawfulness of human conduct.
Hence, you will find in them approval for certain practices, which present day society may not appreciate.