The short answer is yes - - in my case there was a big change when I went through puberty.
Here's the whole story: I began to masturbate at the age of 11 ¾ when I discovered the good feeling of rubbing the head of my penis with a wash cloth one day while taking a bath (I had overheard guys at school talking about jacking off, but I really had no idea what they were talking about). As I continued to rub it, I was soon overwhelmed by my first orgasm, dry, as all my muscles tightened up and I felt like I was going to jump right out of my skin!
I almost immediately discovered that I could achieve the same feeling using my hand and soon I was masturbating nearly every day, almost always at night and in bed. I soon found out that by trial and error, I could have multiple orgasms during any one session. Now it usually took about four minutes of stroking to achieve the first orgasm which was always very intense. All my body muscles would tighten up as I climaxed and my stroking arm would actually lock up; I couldn't have continued stroking if I had wanted
to.
The first couple of times I jacked off it felt so good that I tried to start stroking again as soon as my muscles relaxed enough to allow that - maybe five or six seconds after the orgasm hit. I found that to start stroking again so soon actually hurt - my body and especially my cock head was still way too sensitive. After some trial and error, I soon realized that if I waited about twelve to fifteen seconds for the intensity to diminish and my muscles to relax and the sensitivity to wane, I could start stroking again and bring on additional orgasms with only about fifteen to twenty strokes on my penis.
Boy was that great! I was essentially going from one orgasmic high to another without having to start all over again from scratch, a process similar to that which some women experience. What I had discovered was what I called my "window of opportunity." As noted above, I had to wait for the sensitivity to decrease until the right moment to begin stroking again. However, if I waited too long I would "lose it" and have to start all over again from scratch. Anyway, I almost always had four or five orgasms and sometimes as many as six or seven during one session. I was always exhausted at the end of each session and quickly fell asleep.
About a month before my 13th birthday I was having a session as usual and noticed when I orgasmed I had a drop of clear oily substance on the head of my penis. I had had my first ejaculation!
During the next several weeks I noticed many significant changes in the way my body was functioning sexually. First, I noticed the time necessary to achieve the first orgasm dropped rapidly. As noted above, the first orgasm used to take almost four minutes with approximately 400 strokes needed. This fell to where I was consistently able to reach that first orgasm in a little less than two minutes with only about 200 strokes needed. That was the good news.
The bad news was that I rapidly lost the ability to achieve additional orgasms per session and soon had to "start all over again" if I wanted additional orgasms. At age thirteen that really wasn't a problem as I could achieve a second orgasm and ejaculation (with less cum) with an additional 200 strokes. The waiting period was generally only a couple of minutes and sometimes I even maintained an erection during the "recovery period." The
additional work needed to have multiple orgasms and ejaculations meant that I soon, by age fourteen or fifteen, was content to have only one orgasm and ejaculation per session.
The other bad news is that the intensity of the orgasms diminished considerably. As noted above, I had been consistently having very intense orgasms, even after having several in rapid succession. Then the nature of the orgasms changed; I was now having multiple muscle contractions needed to shoot several spurts of cum out of my penis when ejaculating. I found that from the day that I noticed the first drop of clear cum on my penis, it took about four to six months before I was ejaculating the usual amount of creamy white cum. This usually took place in two spurts (ropes), each approximately two inches long, which shot six to nine inches (occasionally to twelve inches) up on my chest and an additional muscle spasm which resulted in additional cum oozing out of my penis.