There are two effective centers into the figure: that of the circle, the navel O, and the center of the square, the sexual apparatus x.
Yet the first remark I published in 2003 is simple and evident:
subdivided the main square into 4 squares, from the center of the low­er left square's right side i.e. ½, it's easy to refer the golden ratio to the ver­ti­cal mid­line of the body, reaching the point that precisely de­lim­its the me­di­an line ch of the arms in horizontal extension that's to say the height of the articulation of the shoulders with respect to that center x.