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Our attraction to another person's features increases if that face or breast is symmetrical and in proportion.
We believe that features which fit into the 'golden ratio' tell our brain that someone is healthy and good to mate with.
The Golden Ratio is based on a series of digits 1,1,2,3,5,8,13,21...where every number is based on the addition of the previous two and this leads to the ratio=1.618033.
It is everywhere in nature. For instance, it is the size of the bottom lip to the top lip. It is the ratio of breast size to hip size.