Tattoo will be addicted to usually these three types of people:
First, before not tattooed, think tattoo is very very painful and scary, tattooed after the discovery of their own completely able to withstand the sense of pain, the results opened the door to a new world, a hair out of hand;
Second, more or less after some masochistic tendencies of people, will enjoy the pain, in fact, enjoy is not the pain itself, but by the pain brought about by the dopamine secretion;
Third, the principle of people who relieve stress through pain is still because of the secretion of dopamine.
