We can only speculate on evidence we have. The prehistoric chubby dolls (Venus figurines) from archaeological digs that many hypothesized to be fertility totems can be hypothesized to be just idealized symbols of female form as the shape changed depending upon the average temperature - ice age meant fatter dolls, temperate times meant thinner dolls. https://www.sciencealert.com/the-mystery-of-the-enigmatic-ve...