I have been multi orgasmic ejaculator most of my life. I will generally have a few… to 4 or 5 orgasms… crashing waves where my body goes through an almost rhythmic convulsion that will build until I ejaculate. The crashing continues and I sometimes lose or dont lose my erection, but usually can ejaculate 4 or 5 times as well. The best is when the two coincide and believe it or not… when i am flaccid is the most intense, causing sometimes… and spontaneous erection after the gun goes off so to speak… the ejaculate diminishes in volume over time… and the process can take as little as a few minutes to several hours… depending upon mood, health and level of arousal. The most this has ever happened is 13 times in one day… I have not read any books or articles on the subject.