Sperm is being produced in your testes. When you masturbate or jackoff as you put it, it is in the stuff that comes out your penis when you cum/ejaculate.
depends how you go about it
Carmex works wonders
jackoff
No not at all I started when I was 10 or 11
nope, trust me we dont
only if you flush the toilet
jackoff
it depends how little they are and how old you are
No, not unless you are rubbing one out for your child.
By sToping at the climax and using your less dominant hand
jackoff