From Hindu scripture : Atharva Veda 14.2.38 “O Men, you are the strengtheners. You inspire into this lady well-wisher of you and your family the spirit of procreating children. This woman is such an entity in whom the men sow semen-seed, who desiring progeny spread her thigh towards her husband and in whom the husband like you and us thrust organ with the desire of children. O happy bride-groom mount over thigh of your wife and touch with hand, in a joyus spirit your wife. You both delighted with joy procreate children…”” Tr. Acharya Vaidyanath Shastri (Arya Samaj)