A male semen volume of 0.2 ml suggests that the semen volume is too low, which may be caused by frequent sex, ejaculation disorder, oligospermia and other reasons. 1. Frequent sex life: if sex life is too frequent, and the testes can not produce semen quickly in a short time, it may lead to low semen volume in men, and it is recommended to reduce sex life. 2. Ejaculation disorder: it is caused by genitourinary system diseases and psychological factors, which will lead to the decrease of ejaculation ability and the situation of low semen volume in men, and some of them will be accompanied by premature ejaculation. 3. Oligospermia: it may be caused by endocrine diseases, varicocele and other reasons, which will lead to low spermatogenic function, the testes produce less sperm, thus appearing male semen volume is too low. If the low semen volume does not improve for a long time, it is recommended to go to the hospital for semen quality analysis to understand the specific causes.