Definition: Anadidymus is a term in Greek medicine referring to an early stage during sexual activity where two males unite sexually, often for procreative purposes. It's related to the action of ejaculation which can result from this stage. The term 'anadidymus' has been found to be associated with various diseases and conditions such as prostate cancer, testicular tumours, and certain types of semen disorders, particularly in men over 40 years old who are at increased risk due to aging or other health problems.