In most places they can, although there is usually a weight limit. You must also have your legal guardian sign the consent form if you are not 18 years old
Because it gives you something to tell to your friends and family about. It us also considered an extreme sport, therefore it give an adrenaline rush. If your a control freak it's totally something...
All over the world in most tourist destinations and/or major cities. People can bungee jump from buildings, bridges, gondolas and even moving objects like helicopters and hot air balloons.