Many believe that semen only contains sperm and serves the sole purpose of reproduction, but there are many intriguing facts about it that most people may not know. Facts About Male Semen: Sperm and semen can survive for several days, but that's not entirely true. According to doctors, about 500 million sperm are released during ejaculation, but many of them die within an hour. Semen is also believed to enhance fertility. A study conducted a few years ago suggested that semen contains proteins that send hormonal signals to a woman's brain. These signals activate the ovaries, leading to the release of eggs.