In the old days people coordinated their problems and connected big things to small things through correspondences. For example, the Kaballah has the symbolic Sephira that connect something like "Severity" with like, your right hip. In Taoism the Cosmic principles of Yin and Yang and the five elements are made to correspond with and give meaning to various pairs of organs in the body. This is a very healthy minded way to look at the world which (depending on your point of view) either gives meaning to even the smallest thing, or helps reveal the meaning of the smallest things.
Sex is a part of the rest of culture and is best understood and treated as such