From an interview with Hubbard's own son Ron Jr. in the public domain essay entitled Hollywood, Satanism, Scientology and Suicide:
"In my father's private circle," Ron Jr. explains, "there were lots of mistresses. When I was younger, I participated in private orgies with him and three or four other women. His theory was that one has to open or crack a woman's soul in order for the satanic power to pour through it and into him. It got kind of far out, culminating in a variety of sex acts. Dad also had an incredibly violent temper. He was into S&M and would beat his mistresses and shoot them full of drugs."
When asked by an interviewer how this "soul-cracking" worked, L. Ron Hubbard, Jr. said, "The explanation is sort of long and complicated.
The basic rationale is that there are some powers in this universe that are pretty strong.
"As an example, Hitler was involved in the same black magic and the same occult practices that my father was. The identical ones. Which, as I have said, stem clear back to before Egyptian times. It's a very secret thing. Very powerful and very workable and very dangerous.
"Brainwashing is nothing compared to it. The proper term would be 'soul cracking.' "It's like cracking open the soul, which then opens various doors to the power that exists, the satanic and demonic powers. Simply put, it's like a tunnel or an avenue or a doorway. Pulling that power into yourself through another person and using women, especially is incredibly insidious.
"It makes Dr. Fu Manchu look like a kindergarten student. It is the ultimate vampirism, the ultimate mind fuck. Instead of going for blood, you're going for their soul. And you take drugs in order to reach that state where you can, quite literally, like a psychic hammer, break their soul, and pull the power through."