A ==Key Stage 3=====Meaning===The [[testes]] are a pair of [[Organ|organs]] in the [[Male Reproductive System|male reproductive system]] located behind the [[penis]] in the [[scrotum]] responsible for making [[sperm]]. Singular [[Noun]]: '''Testis'''Plural [[Noun]]: '''Testes''' {| class="wikitable"|-|[[File:ReproductiveSystemTestis.png|center|400px]]|-| style="height:20px; width:400px; text-align:center;" |A [[diagram]] of the '''Male reproductive system'''.|} ===About the Testes===: The [[testes]] are found inside a sack called the [[scrotum]].: The [[testes]] are outside the body instead of inside because [[Sperm Cell|sperm]] need to be kept cooler than [[Human Body Temperature|body temperature]] to survive.: The [[testes]] are always making new [[Sperm Cell|sperm]].