Final answer:
Fructose is found in semen and not in urine, providing nutrients to sperm for motility and energy.
Step-by-step explanation:
One component that is found in semen but not in urine is fructose. Fructose is a simple sugar that provides nutrients to sperm, aiding in their motility and energy. It is one of several substances produced by the accessory glands of the male reproductive system, specifically the seminal vesicles, which contribute to the composition of semen. While semen also contains water and bicarbonate for pH buffering, fructose is distinctive as it is not a common component of urine, which is primarily a waste product containing substances that the body needs to excrete.