The text is clearly written and technical terms are explained. A particular strength is close-up photos of the genital areas of a variety of men. Each of these is paired with a line drawing of the same scale based on that photograph and showing the underlying anatomy. This arrangement makes it easy to relate what one sees on the table during a session with what one is feeling beneath the skin as one works.
Other chapters on foetal and juvenile genital development, posture, and sexuality are also very informative.
I have no hesitation at all in giving this excellent book five stars.