No I don't think so but if it does ask a doctor or masturbait it can help both ways good luck
No not at all except if you already have got a loose foreskin it became to loose and will not stay behind the head of the penis.
Some have it; there is no problem with it.
No.
The most common causes of overheating and shaking in a vehicle are the head gaskets. A blown head gasket will produce overheating and shaking and may lead to a cracked head.
When a boy penis starts shaking, it means it got aroused when you lean to it. It excites him that his penis started to moves, getting bigger, longer and harder. When you hold his penis actually, maybe, your boyfriend will release his semen untimely.
use google
The violent shaking causes buildings to fall. It also causes causality loss of the people inside it.
Because sometimes the universe is shaking, and that is what causes it.
Violent shaking can cause certain soils to flow. The shaking results from a nearby earthquake.
He could either be shaking due to cold or something has scared him, badly. See where he goes and when he starts it up to evaluate the problem.
penis
Certainly no. As long as you enjoy that and the same is not effecting you in your other day to day activities and you don't have any guilt there is no side effect in shaking penis twice a day. Go on and enjoy life