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Testicles move closer to the body when they are too cold, and further from the body when they are too warm. They also move closer to the body when a man ejaculates. In some men, they move so close to the body during ejaculation that they almost seem to disappear.
There are two different muscle groups that help raise and lower the testicles: the cremaster (skeletal muscle) and the dartos (smooth muscle).
Cremasters Each testicle has its own cremaster muscle. The cremasters begin in the abdomen. They hoist and lower each testicle like the chain on wrecking ball or the chord of a chandelier. When they are activated by cold or ejaculation, the cremaster muscles quickly draw the testicles closer to the body.
If you want to make your boyfriend’s balls go up and down, try running your fingertips along the skin of his inner thigh. This will trigger the cremasteric reflex, which should cause at least some upward movement of the testicle on that side of his body.
Dartos The dartos is a very different type of muscle than the cremaster. It is actually a sheet of smooth muscle that runs along the wall of the scrotum. It makes the scrotum cradle the testicles like a pair of hands that slowly draws the testicles into and away from the body.
When the testicles are cold, the dartos contracts, making the skin of the scrotum pucker up. This reduces the surface area of the scrotum so less heat can escape. When the testicles are hot, the dartos relaxes. This lowers the testicles away the body and increases the surface area of the scrotum so more heat can escape.
The cremasters work quickly, while the dartos muscles work much more slowly.
A special thanks to Dr. Claire Yang.
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