The fact that you have a lot of people in your life who are not in the same boat as you are in the same house is a good sign that you are not in the same boat as you are in the same house, but you are in the same house. 1. Physiological factors: frequent masturbation or frequent sex, frequent ejaculation, so that the sperm content in the semen is too small, it will make the semen more sparse, semen like water. 2. Spermatitis: it may be related to retrograde infection, blood-borne infection and other factors, after the increase of inflammatory substances, it will lead to sparse semen, spermatozoa like water, may also be accompanied by ejaculatory pain, blood semen and other symptoms. 3. Prostatitis: it may be related to poor hygiene, sedentary, long time holding urine and other factors, because prostate fluid is an important part of semen, when there is prostatitis, it may also make the semen more sparse, accompanied by perineal swelling and pain, frequency of urination, urinary urgency and other symptoms. If the semen is like water, it is recommended to seek medical examination and treatment to avoid adverse effects.