Ok here we are a nice science article wich explains why you like round boobs.
Numerous studies of symmetry in humans have shown that men especially are more attracted to women with symmetrical features. (One hypothesis suggests that women are not as concerned with symmetry because instead of breeding, they look for a mate that can provide food and protection for their offspring, i.e., money and power for humans (2).
Studies have shown that men are most attracted to women with a waist-to-hip ratio of 0.7. A group of researchers at the University of Texas at Austin decided to compare that number to the average ratio of winners of the Miss America pageant and found that the two numbers were identical (2).
The specific 0.7 ratio suggests a woman's fitness and ability to bear children (younger girls lack the curves while older women tend to develop more fat around their waist). Surprising to some, the attractiveness of women with a waist-to-hip ratio of 0.7 holds true over a range of weights (2).