The normal volume of semen ejaculated by males through sexual intercourse or masturbation is 3-5 milliliters. The semen appears greyish-white, weakly alkaline, and has a special fishy smell, which mainly comes from the odor of prostatic fluid. Among it, seminal plasma accounts for more than 95%, while sperm accounts for less than 1%. Each cubic centimeter of testicular tissue can produce 2 million sperms per day, meaning that each male's testicles can produce tens of millions to hundreds of millions of sperms daily. Even if these sperms are not expelled from the body, they will also age and die, and finally be digested by enzymes.