The Cambridge History of India, Vol. I: Ancient India v1.c17.56

v1.c17.56

There is hardly any mention of other forms of crime in the Rigveda. It appears clear that marriage of brother and sister was regarded as incest, and apparently marriage of father and daughter was placed in the same category of wrongful actions, as it certainly was in the later Saṃhitās, where the union of Prajāpati, one aspect of the supreme god, with his daughter is at once punished by the other gods. Prostitution was certainly not unknown, but in other respects morality seems to have been fairly high: there is no sufficient ground for attributing to the peoples whose actions are reflected in the Rigveda either the exposure of the aged or the putting away of female children.