Hello There can be many reasons for ejaculatory anhedonia.It is thought that people who suffer from this disorder suffer from a dysfunction in the release of the chemical dopamine in the nucleus accumbens, the brain s reward center. This part of the brain is thought to play a role in pleasurable activities, including laughter, addiction, and music. Additionally, it is thought that depression, drug addiction, high levels of prolactin, low testosterone, and uses of certain medications might play a role in inhibiting dopamine. A spinal cord injury or chronic fatigue syndrome might also occasionally cause this disorder.Age may also be a cause of this disorder. Sudden onset sex anhedonia can be due to pyridoxine toxicity Treatment consists of removing the cause AND prescribing medicines like Adderal, Sildenafil,Bupropion and psychological treatment DR SAATIISH JHUNTRRAA