 The yin and yang theory proposes that an unbalanced loss of the yang humour produces genital shrinkage.In Taoism and Traditional Chinese medicine, frequent ejaculation is regarded as detrimental to health, as semen is considered to be related to a man's vital energy, and hence excessive depletion of semen may lead to illness or death.Some authors believe that the idea of death caused by the semen depletion resembles the idea of death caused by genital disappearance, although such linkage between koro and Taoism, which influences Chinese medicine to some degree, is only speculative.