This Tantra is a relatively short work of fifteen chapters and belongs to the Kula tradition. The dating of the text is uncertain, yet we do know that most of the Kula-works originated during the 9th to 12th century.
The Niruttara is very much a women’s Tantra with a rather liberal outlook concerning women’s lifestyle and sexual freedom, a life far less ruled and regulated than Indian society would normally permit. The women who follow the path of the Kula are sketched in the text as roaming about freely (in the sense of the independent virgin, not the physical type) and enjoying themselves like the Goddess Kali does.
The Tantra describes extensively the seven different "types" of veshya; ritual prostitutes who are sometimes employed as participants in sexual rituals.
Apart from this, the text explains various modes of worship directed
towards several goddesses but is especially focused on Kali, the great
"Black Mother of Time, Life, Sexuality and Death". The work speaks in
detail about important rituals (Mahachakra, Rajachakra)
and is quite unique in allowing woman truly the same sexual freedom as
is usually given to male devotees. The text says explicitly that
a woman has no fault in being united with a person other than her husband.
[Banerjee, S. C. A Brief History of Tantra Literature. Calcutta, 1988. p.258]
A study of the Niruttara Tantra makes it clear that also very young girls - a relative definition depending on a given social context - practiced sexual union. It is important to realize at this point that many non-European cultures also practice(d) marriage at a very young age. Even in 1989, the average (!) age for marriage in Bangladesh was 11.6 years and in Pakistan 15.3 years.
The text states that such a woman (i.e. one who practices Kularcana), should choose Shiva as 'her husband'; yet we know of course that Shiva is the designation for any man in a Tantric ritual - just as any woman becomes the Shakti. Depending on their age, the young women are associated with a number of powerful goddesses: