From an evolutionary perspective, Shackleford and Larsen (1997) suggested there are certain physical traits which we are pre-disposed to find attractive. For example, females with neotenous (child-like) faces are more likely to be viewed as attractive by males because their facial features (eg - a soft chin and large eyes) trigger an aggressive and protective trait in men, which gives the female an evolutionary advantage (increasing their risk of survival and reproduction). This, alongside facial symmetry, signifies a high-quality mate due to their displayed genetic fitness.