Give one method to prevent both STD and unwanted pregnancy.

Explanation

**Step-by-Step Solution:**

1. **Understanding the Terms:**
- The question asks for a method to prevent both sexually transmitted diseases (STDs) and unwanted pregnancies.
- STD stands for Sexually Transmitted Diseases, which are infections that can be transmitted through sexual intercourse.

2. **Identifying a Suitable Method:**
- One effective method to prevent both STDs and unwanted pregnancies is the use of condoms.
...