If a survey were to be conducted of the different types of tattoos women have or would like to have, an overwhelming number of them would have the heart symbol in some form. The reason behind this is both psychological as well as due to the influence of pop culture.
Women tend to be more emotional and as such associate more with the heart. They are also introduced to the imagery of the heart from a very young age in the form of toys and literature and as such grow to associate familiarity with the symbol. In short, it is a celebration of everything a woman is and that is why women heart the heart tattoo so much.