Here's why:

* Germinal epithelium is responsible for the production of sperm cells (spermatogenesis). This process involves a complex series of cell divisions and transformations.

* Epithelial tissue is generally characterized by closely packed cells that form a covering or lining.

However, the testes also contain other types of tissue:

* Connective tissue: Provides structural support and helps hold the various components of the testes together.

* Smooth muscle tissue: Helps regulate the movement of sperm through the reproductive tract.

* Blood vessels: Supply the testes with nutrients and oxygen, and remove waste products.

* Nerves: Provide sensory and motor innervation.

So while the primary tissue type is epithelial, the testes are a complex organ composed of various types of tissue that work together to fulfill their vital function of sperm production.