Aleister Crowley became involved with Theodor Reuss and Ordo Templi Orientis following the publication of The Book of Lies between 1912 and 1913.^[5] According to Crowley's account, Reuss approached him and accused him of having revealed the innermost (sexual) secret of O.T.O. in one of the cryptic chapters of this book. When it became clear to Reuss that Crowley had done so unintentionally, he initiated Crowley into the IX° (ninth degree) of O.T.O. and appointed him "Sovereign Grand Master General of Ireland, Iona and all the Britains."^[5][6][7]

While the O.T.O. included, from its inception, the teaching of sex magick in the highest degrees of the Order, when Crowley became head of the Order, he expanded on these teachings and associated them with different degrees as follows:^[8]

• VIII°: masturbatory or autosexual magical techniques were taught, referred as the Lesser Work of Sol
• IX°: heterosexual magical techniques were taught
• XI°: anal intercourse magical techniques were taught.

Professor Hugh Urban, Professor of Comparative Religion at Ohio State University, noted Crowley's emphasis on sex as "the supreme magical power".^[6] According to Crowley:

The Book of the Law solves the sexual problem completely. Each individual has an absolute right to satisfy his sexual instinct as is physiologically proper for him. The one injunction is to treat all such acts as sacraments. One should not eat as the brutes, but in order to enable one to do one's will. The same applies to sex. We must use every faculty to further the one object of our existence

                                                  Affairs and scandals

“To others, the universe seems decent because decent people have gelded eyes. That is why they fear lewdness. They are never frightened by the crowing of a rooster or when strolling under a starry heaven. In general, people savor the "pleasures of the flesh" only on condition that they be insipid.
But as of then, no doubt existed for me: I did not care for what is known as "pleasures of the flesh" because they really are insipid; I cared only for what is classified as "dirty." On the other hand, I was not even satisfied with the usual debauchery, because the only thing it dirties is debauchery itself, while, in some way or other, anything sublime and perfectly pure is left intact by it. My kind of debauchery soils not only my body and my thoughts, but also anything I may conceive in its course, that is to say, the vast starry universe, which merely serves as a backdrop.” 
― Georges Bataille, Story of the Eye