What causes a man to not be able to climax or ejaculate can include aging, obesity, or psychological factors, but can also be a sign of a more serious problem. When a man cannot ejaculate, this is sometimes called anejaculation.
Other possible causes include genitourinary infections, diabetes, especially when diabetic neuropathy is present, and retrograde ejaculation, which happens when semen goes backward into the bladder instead of out through the penis. Some medications, especially certain antidepressants, can also make it harder to ejaculate or reach orgasm.
Spinal cord injuries or damage to the pelvic nerves can also affect ejaculation, especially after an accident or surgery. Neurological conditions, such as multiple sclerosis, Parkinson’s disease, or transverse myelitis, may also interfere with the nerve signals involved in ejaculation and climax.
If you think you may be having a problem with ejaculation, it is important to see a healthcare provider so the underlying cause can be identified and the most appropriate treatment can be recommended.