The fact that you are sitting for a long time and feel a sense of ejaculation may be a physiological phenomenon, but it may also be due to prostatitis, urethritis and other diseases. 1. Physiological phenomenon: usually, consider that may be due to a long time to sit down, the penis caused by extrusion, so that it is subjected to sexual stimulation, followed by excessive congestion, so men will appear to sit down for a long time to feel a sense of ejaculation of the situation, belongs to the normal physiological phenomenon, do not have to worry about too much. 2. Prostatitis: This disease is mainly caused by pathogen infection, can be induced by irregular sexual life, sedentary, long period of riding across the bad lifestyle, some patients may appear to sit for a long time feel ejaculation symptoms. 3. Urethritis: the occurrence of the disease is related to gonococcal and non-gonococcal infections such as Chlamydia trachomatis, Mycoplasma, etc. Common triggering factors include high-risk sexual behavior, contact with infected items, and so on. Since patients with urethritis experience burning sensation in the urethra, frequent urination and urgency to urinate, some patients may mistake the sensation of urination for ejaculation infection. In summary, if the feeling of ejaculation after sitting for a long time is ruled out as a result of physiological factors, it is necessary to go to the hospital in a timely manner to clarify the specific causes.