Semen consists of spermatozoa and seminal plasma, and seminal plasma can contain fructose and other sugars, so it can be sweet, in addition to being affected by a high-sugar diet, diabetes, and so on. 1. Physiological factors: spermatozoa account for 5% of the semen, the rest is mainly seminal plasma, because the seminal plasma contains a variety of substances, including water, fructose, proteins, fats, a variety of enzymes and inorganic salts, etc., is the nutrients of spermatozoa, so the normal situation can also be sweet phenomenon, and in addition to its often also has a kind of briar flower odor. 2. Diabetes: If there is too much sugar intake or diabetes, semen can also be sweet this phenomenon, it is recommended to pay attention to their own blood sugar problems, you can go to the regular hospital to do a fasting glucose test to determine whether or not diabetes, such as diabetes should actively cooperate with the doctor’s guidance and treatment. The sweetness of semen may also be caused by other factors, it is recommended that patients go to the regular hospital for treatment, and strive for early recovery.