Sperm cells need energy to swim. Cells in two small glands called seminal vesicles make a fluid with sugar in it.
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Boys and men have two small glands called seminal vesicles. They sit behind the bladder. They grow and start working when someone grows up.
Inside, each one is a pouch with lots of folds, a bit like a honeycomb. The folds are lined with cells that make and release fluid. These are called secretory cells.
Sperm cells carry half of the instructions (DNA) needed to make a baby. When a sperm cell and an egg cell join, a baby can start to grow.
Sperm cells swim with a tail, and swimming takes energy. The seminal vesicle cells make a thick fluid with a sugar called fructose in it. The sperm cells use that sugar as fuel.
Fructose is the same kind of sugar found in fruit!
Press Add sugar on the 3D model to see the cells release their sugary fluid.