Which structures in a male produce fluids that mix with sperm to form semen?

Explanation

**Step-by-Step Solution:**

1. **Identify the Question**: The question asks for the structures in males that produce fluids which mix with sperm to form semen.

2. **Understand the Role of Accessory Glands**: In males, there are specific glands known as accessory glands that contribute to the formation of semen.

3. **List the Accessory Glands**: The accessory glands include:
- **Seminal Vesicles**: These glands produce a significant portion of the fluid that makes up semen, providing nutrients and energy for the sperm.
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