If you do not ejaculate for a long time, you need to consider that it is caused by ejaculation. 1.Functional ejaculation: It is mainly due to the inhibition of the ejaculatory center by the brain, or the insufficient degree of sexual stimulation, resulting in normal sexual life cannot induce the ejaculatory process, the main causes are various mental and psychological disorders, long-term masturbation, female vaginal relaxation, etc.; 2.Organic ejaculation: It means that there are clear tissue and organ factors that cause ejaculation, such as Neurological injury, penile trauma and other causes; 3. Medication-based ejaculation: Since certain drugs can inhibit the ejaculation process, such as sedative-hypnotic drugs and antidepressants, the application of the above drugs can cause ejaculation. When there is a long time sex still can not ejaculate, it is recommended that patients go to the regular hospital for timely examination to avoid delaying the condition.