There are two types of texts, sruti and smruthi. The books of eternal truth such as Vedas and upanishads are knwon as sruti texts. The texts that have been created by mortals about the cultural issues are known as smruthi.

Smruthi texts differ from time to time, i.e., in each yuga. Manu smrithi was written in Krutha yuga applicable only to that yuga. For the present Kali yuga, Parashara smruthi has been made as the rule book. (Parashara was the father of Ved vyaas). The rules of this book (for Kali yuga) are not too strict as Manu smrithi, particularly the verses pertaining to women. We must remember that Parashara himself sought a relationship with Satyawathi that could not be accepted by the moral values of our society, and Satyawathi as wife of Shantanu, was responsible for involving Ved vyasa, in begetting the three sons of Mahabharatha fame in methods not acceptable. This itself signals that rules for this yuga are defined on the basis of happenings that commonly occur in this yuga.Manu smruthi is studied for academic interest and to see how rules for mankind had changed with time.

Kama suthra is not to be mixed or confused with these texts. It is an independant treatise and as has always happened, anyone desirous of writing a book on their topic of choice is free to write.And that is how it was written..