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Technically, your balls drop when you're born, but it's also a term used for guys going through puberty, when their testicles grow bigger and hang lower.

Before puberty a boys (balls) are small and round. When you get to puberty your testes (the balls inside the scrotum) start to grow bigger so that they can make sperm. Healthy sperm is kept at a lower temperature than the rest of your body so the scrotum starts to get looser and hangs further away from the body to help keep the testes cooler. When this happens a boy's balls are said to have dropped. Even after they have "dropped" a boy's balls can sometimes draw up close to his body, usually when it is cold or when he has an erection.

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12y ago

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