How do you jerka a boy's penis?

Answer 1

Assuming you mean how do you masturbate:

1. get an erection

2. pull foreskin back

3. wrap your hand around your cock

4. fastly move your hand up and down the cock

Then you should get a warm feeling inside, this means sperm is getting ready to shoot out. so keep fastly moving your hand up and down your cock and then eventually sperm will shoot out of your bell end.