I was brought up on my parents farm where we had many animals. (Mainly cows, pigs, and sheep.) As a farmboy both me and my younger brother were well aware of animal breeding from a quite early age, as would ALL children who grew up on a farm. Whenever we had a cow "on heat" and my Dad wanted the cow to be "served", at milking time he would separate the cow out, and place the cow into a small paddock where we kept our bull. Then Dad would head off to milk the rest of the cows, with the instruction to either myself or my brother (whoever was left in charge of "watching"…) to keep an eye on the cow and bull, to confirm that they mated correctly. My Dad would later return and ask me (or my younger brother) "Did he get it in?". This was something I had to watch and report on from a very early age... probably about 5 or 6 years old.
We also ran hundreds of pigs, so again I was very well aware of animal sexuality in that regard.
I always remembered, when asking my father about how human babies were made, that he said that "... the man places some seed inside the woman", but never went into the specifics at the time... when I was probably still around 7 or 8 years old. It always intrigued me, at that age, how a man could put a "seed" inside the woman. A seed? We also used "seeds" to grow wheat and oats, and my Mum sowed seeds in the garden she maintained, so I always had in my mind that it was something like that kind of "seed", and it REALLY intrigued me. From my MANY occasions of watching our bull service the cow, sometimes the bull would not get his LONG thin cock inside the cow, but down the side of the cow, and then squirt some "watery stuff" down the side of the cow. In my head, I had wondered if Dad's comment about a man's "seed" might have been something like that.
From the time I was about 10 years of age, while having a bath alone, I started to get into the habit of playing with the soap around my cock, because even at that age it felt really good, and it was around that time that I discovered that I could get an erection by doing that. But all I used to do was simply play with my cock, by rubbing the soap around my cock. It was not actually jerking off as I was later to learn about.
By the time I was 11 years of age, this became a VERY common habit, simply because it felt so good... just hoping that nobody would storm into the bathroom unannounced and catch me doing this... because I somehow felt that maybe this was not the thing to do and that I might get into trouble.
Eleven years of age, and in the bath alone one night, and I was up to my usual "playing" with my cock and soap, when suddenly and quite unexpectedly, my cock gave me this "weird but good" feeling, and some white creamy stuff came out of it. Initially, I just sat in the bath in some kind of awe and fascination at what had just happened, then almost suddenly... it dawned on me. "Ah...! So THIS is the 'seed' that my Dad had always talked about'''!". It wasn't quite the type of human "seed" that I had assumed for so many years, but at that moment everything suddenly became so very clear.
I could not wait to tell my younger 9-year-old brother. He and I had discussed this "seed" topic a few times, and we had both been intrigued by what this human "seed" was. So I hurriedly completed my bath, dried and dressed, and was SO excited to be able to tell my brother about what had just happened and what I had just now learned. But it was dinner time, and we had to sit up at the dinner table and have our meal. But at the earliest opportunity after dinner, as soon as I had the opportunity, I pulled my brother aside, and discretely got him into the bathroom. I was SO excited to be able to tell him that I now knew what human "seed" looked like. Not only did I want to TELL him about it, but I wanted to SHOW him as well. So I dropped my shorts, got some soap and a little water, and I started rubbing my cock again, in the hope I would be able to demonstrate what happened.
It took me some time, I guess primarily because I still had to learn the more economic approach to jerking off, rather than simply rubbing my cock, but after several minutes I succeeded with just a little more of this white creamy stuff that oozed out of my cock. I would hardly call it "shooting" at that stage, although, as I recall, it was not very long before I was able to achieve a more "shooting" type of outcome. I guess that came from practice, because after this amazing revelation, I got to jerking off VERY often. By the time I was 12 years old or so I was in the habit of jerking off several times a day. It felt really, really good, and I just HAD to keep doing it.
By the time I was in High School (I was around 14 years of age...), I was obviously well aware that most of the other boys were also jerking off on a regular basis, although I was more than a little concerned about it though. I remember talking to one of the older boys who I knew quite well at my school about all of this because he seemed SOoo grown up, and such an "expert" on these things... or that is how I saw it at the time. I very CLEARLY recall telling this 16-year-old one day while travelling home on the school bus about the fact that I was jerking off so much, and that I was getting worried. "Is my body going to run out of sperm?!".
Yes, I began to worry that if I kept jerking off on such a regular basis, that perhaps my body (which I assumed had only a finite amount of sperm) would run out before I became an adult, and got married. And if that happened, how would I explain to everybody (my family etc.) why I was not able to father children when I got married. This became a major concern of mine from around 14 years of age. My much older 16-year-old friend told me that he believed there would not be a problem into my adult years, although he did not seem to be 100% confident of this. So this worry continued with me for a little longer... probably until I myself was around 15 or 16 years of age, when I was able to find something about human sexuality in the school library (a very SECRET search of the library...!) that seemed to indirectly assure me that the human male body does not run out of sperm, no matter how often you jerk off.
Needless to say, but I continued to jerk off several times a day (sometimes 6-8 times per day), until my mid/late teens when I found other more exciting ways of getting the same "feeling" in my cock (it's called "fucking"...), without having to actually jerk off... but that's another story for another day.