It's not quite accurate to say there are only three glands in the male reproductive system. While there are three main glands that are crucial, there are actually several other glands involved in various ways.

Here are the three main glands:

1. Testes: These are the primary male reproductive organs, producing sperm and testosterone.

2. Prostate gland: This gland surrounds the urethra and contributes to semen, which helps nourish and transport sperm.

3. Seminal vesicles: These paired glands secrete a fluid that makes up a significant portion of semen, providing nourishment and helping sperm motility.

Additional glands involved in the male reproductive system:

* Bulbourethral glands (Cowper's glands): These glands secrete a mucus-like fluid that lubricates the urethra before ejaculation.

Let me know if you'd like to know more about any of these glands or other aspects of the male reproductive system!