Sperm

Sperm is made in the testacles that are housed within the scrodum. Semen and sperm however are not the same thing, semen is actually the fluid or liquid that nourishes and carries the sperm. Semen is made of many liquids created in the prostate gland and seminal vesicles. Both semen and sperm are in the seminal vesicles prior to ejaculation.

Related References

 * Sperm Answers.com