Possibly. If you "practice" too many times a day, you could deplete your supply. There will be no birth defects, it will just take more work. Hand practice is a good way to judge when you will reach orgasm and be more prepared.
No sperm keeps on being made all of your life. As you get older the quality of it gets lower but masturbation will not effect it at all.
It seems that "handpractice" is another term for masturbation.
does handpractice create knee problem or not...........
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No. It will have virtually no effect on your health at all.
There are none. It can only cause pleasure.
I don't think it will have a harmful effect.
The effects of hand practice on health are quite severe. The arteries on the penis are destroyed which will block the blood circulation in that area and it generally weakness the general health of the reproductive system.
None.. Your testicles produce sperms constantly.
This is a very good question. No such studies are conducted in the first place. This drug probably does not affects the sperms. Thankfully, only healthy sperms can reach the ovum most of the times.
The effect is not supposed to be reproductively significant as the digestive and reproductive systems are not directly linked.
there is absolutly no effect in the eggs or sperm. that's just some dumb kids who said that to make fun of someone else.
if sperms were larger than eggs, al the sperms will squash the egg and there will be no baby!!!