Alain Danielou’s translation of the Kama Sutra serves as a great historical text about the sexual mores and sexual politics of Ancient India. My own inhibitions maybe be showing, but I wouldn’t blindly follow its advice as sex manual in modern days since some of its techniques shouldn’t be used without your partner’s consent, ie. hitting, biting and scratching. It’s also non-PC at points since the list of partners available to various classes of men in historical times sounds like people they were free to sexually harass instead of recommendations on who it’d be best for them to approach. However, it will certainly help flesh out details for a writer who wants to write historical fiction in that era.