Hi, I will refer only to information raised by Castaneda's books. In my opinion there are a couple of things that I think are important to consider; first, that you know, don Juan Matus used much the "trick" in their interaction with Castaneda (for example, similar to that used Gurdjieff that you can see in the movie "Meetings with Remarkable Men" in the scene of the sale of a little bird), so in my opinion is good to read all Castaneda's books, because what at first appeared to be very crazy or "blasphemous" by don Juan, on the next book, or much later, in the following books, he said the same, but in another and very different context, and in this sense, about the "holes", don Juan also noted that it's an ERROR not have sons (in fact, don Juan had a son, one who died crushed by a tractor). At the same time, he said that is important reestablish this energy, in what way?, well, through the recapitulation of our lives, meditation, and in synthesis, with all of the work that is proposed here). He also said that people who had no sons, actually had more energy, but they are too restless and "dispersed", however a person who had had children, was more centered and balanced ... you see that it´s an example of how all depends on the approach you give to this. But respect to regard to donate sperm, I do not know, but it sounds so coarse and it smells much "reptilian plan"... maybe it´s a pre judgment, but if I were you, I would not participate in that situation.. again, at the risk that I'm wrong, well... cheers.