Prickle, yes there have been some occasions when I have let slip my cum in a co0ndom during sex, but this is an exception and not the norm for me. I am human, not a robot.
Holding it back has caused no negative side effects. In fact it is all benificial. I feel the same loss of sexual tension after I climax as I would if I did ejaculate. However, I don’t feel so drowsy and atrophied afterwards, which is a major plus. I can get my dick up much much quicker afterwards using this way and it often actually gives me a rush of energy after I climax this way, unlike when you ejaculate. I just don’t feel as wasted afterwards.
Now what supersizeit has some truth to it. I make sure that I cum once ever 7 days or so, because the testicals need to be refreshed with new semen and get rid of old semen that would eventually solidify and cause blockages and toxins.
However, over ejaculation drains life energy and can cause serious kidney problems later in life. It leaves you with less energy through out the week.
The key is to find the balance. Using dry climaxing as the main part of your climaxes, to preserve your testosterone levels(important in aging men especially), and preserve the amount of energy and vibrance you have in the rest of your life, whilst using ejaculation once a week or so to re-new your semen and wash away things that although far from causing any down-side, would eventually do so if you left it there for weeks or months on end.