Although it did not feature explicit images of sex acts, its descriptions of sex acts were unprecedentedly detailed, addressing common questions and misunderstandings Reuben had heard from his own patients.
Most notably, Reuben dismissed popular medical-psychiatric notions of "vaginal" vs.
What sexual information was available was generally only available in the form of illicit pornography or medical books, which generally discussed either sexual physiology or sexual disorders.
The authors of medical works went so far as to write the most sexually explicit parts of their texts in Latin, so as to make them inaccessible to the general public (see Krafft-Ebing's Psychopathia Sexualis as an example).
It is a Daoist text purporting to describe how one might achieve long life and immortality by manipulating the yin and yang forces of the body through sexual techniques, which are described in some detail.
Constantine the African also penned a medical treatise on sexuality, known as Liber de coitu.
Books such as Mark and Grace Driscoll's Real Marriage encourage Christians to experiment in the bedrooms with their spouses, even encouraging acts that have long been rejected by protestant tradition such as anal sex.
One of the currently most well known in America is The Guide to Getting it On! Now in its seventh edition, it has won several prestigious awards and been translated into 12 foreign languages since appearing in 1996.
It was compiled by the Indian sage Vatsyayana sometime between the second and fourth centuries CE.
His work was based on earlier Kamashastras or Rules of Love going back to at least the seventh century BCE, and is a compendium of the social norms and love-customs of patriarchal Northern India around the time he lived.