Semen is the reproductive fluid that a male ejaculates through the urethra and out the end of the penis. Semen, also sometimes referred to as ejaculate, is produced in the gonads and is made up mainly of amino acids, enzymes, fructose, and sperm.
Sperm is the male reproductive cell. When it combines with a female egg, it causes pregnancy in women. To avoid unwanted pregnancies, couples can use several forms of birth control, including condoms, spermicides, and oral contraceptives.