Sperm-holding behavior like this one is not going to have much effect on the testicles and there is no need to worry about the possibility of testicular cancer. The cause of testicular cancer is still unclear, testicular cancer is usually affected by drugs, paints, chemicals, X-rays or the rest of the radiation, resulting in abnormal proliferation of testicular cells, and thus cancerous. However, holding back the semen is mostly a kind of compulsion against one’s will, and it is easy to make the human body mentally stimulated after a long period of time, so that habitual non-ejaculation and retrograde ejaculation will occur. Retrograde ejaculation refers to ejaculation into the bladder. Holding back sperm can also induce impotence . Cysts, prostatitis, prostate stones, seminal emission and other appearances.