When masturbating or having sex, wrapping and blocking with cling film without ejaculating is likely to cause prostatitis, ejaculation disorders and other diseases and should stop this behavior. When a man gets an erection from sexual stimulation, the prostate, seminal vesicles and other genitourinary systems become engorged with blood, prostatic fluid and seminal vesicle fluid are secreted into the urethra, and semen is ejaculated at orgasm, then the blood vessels contract, congestion subsides, and the tissues and organs return to normal. If you block the urethra and hold back from ejaculation, the tissues and organs are in a state of congestion for a long time, which in the long run may form bruises, edema, sterile inflammation, and eventually may cause prostatitis and vesiculitis. Even ejaculation disorders such as erectile dysfunction, non-ejaculation, reverse ejaculation. Therefore, do not try to prolong the ejaculation time by blocking the non-ejaculation. If you are troubled by premature ejaculation, you must seek medical examination and treatment at a regular hospital as early as possible to avoid delaying the condition.