Hi there. Sexual anhedonia in males also called ejaculatory anhedonia, which means the person ejaculates, but without any sense of pleasure. Hypoactive sexual desire disorder or the inhibited sexual desire, low testosterone levels, spinal cord injury, multiple sclerosis and use of antidepressants esp. SSRI can cause this. Fatigue and physical illness can contribute. You need to consult a neurologist, they might prescribe you anti depressant like sustained release bupropion to relieve this sexual dysfunction. Hope this helps. Take care.