I dug out that paragraph from Extended Sexual Orgasm about possible penis enlargement from ESO. It is about a 270 page book, they only spend a paragraph on it:
On the ESO book, The book is about 267 pages. Discussion of possible penis enlargement is just a paragraph.
Here it is:
Some men experienced in ESO have reported some long-lasting if not permanent increase in the length of their penises - up to an inch. This increase may come from a stretching of the ligaments that support the penile bulb rooted inside the the body. Frequent, prolonged, and maximum erection, all part of ESO, stimulate the penis over a period on months to enlarge to its maximum length and thickness. Further stimulation comes from the exercises we’ll be recommending [my note: KEGELS] to strengthen the PC muscles and muscles at the penile base and from the stimulation techniques of ESO itself, which push the deep penile bulb forward [external prostate stimulation]. A man can track changes in penile length during ESO training by measuring his erect penis along the top, from pubic bone to tip. If penis size is a concern of yours or of your partner’s, this increase could be a fringe benefit of learning ESO.
p. 45-46
So basically lig stretches, frequent prolonged maximum erections, kegels, and external prostate stimulation (done like behind-the-ball jelqs). HA HA sounds like a PE routine.