Weakness and lack of pleasure in ejaculation are usually caused by weak contraction of the smooth muscles that govern ejaculation, decreased sensitivity of the glans, and endocrine system pathology. 1. The smooth muscle contraction of ejaculation is weak: commonly caused by frequent masturbation, over-indulgence, frequent ejaculation can lead to prostate, seminal vesicle glands, urethra, pelvic muscles and other contraction of weak, resulting in ejaculation weakness and lack of pleasure. 2. Decreased sensitivity of the glans: most often seen in frequent masturbation, frequent masturbation can lead to excessive stimulation of the glans, thereby reducing its sensitivity, which can lead to ejaculatory weakness without pleasure. 3. Endocrine system lesions: such as pituitary gland and testicular lesions, sex hormone secretion abnormalities, etc., can cause the body androgen levels to decrease, resulting in a decrease in libido, the patient may appear ejaculatory weakness without pleasure. If the ejaculatory weakness is due to frequent masturbation, over-indulgence, abstinence for a period of time can be restored on its own. If it is due to endocrine system pathology, then you should go to a professional hospital in time to find out the cause of the disease and actively treat it.