Cause you are dating part of your relatives. A first cousin has a considerable amount of genetic similarity to you, so there would be some degree of inbreeding if you were to have children together.
No. Even dating your sibling or parent is not incest. Having sexual relations with a parent, sibling, or son or daughter is incest. That is a very different activity.Unless you're really into...
No. Incest refers to any sexual activity between closely related persons (often within the immediate family) that is illegal or a social taboo. "Closely related" for this purpose is usually people...
You can date anyone you like, even your sibling, and it would not be illegal.
However, if "dating" is a code word for "having sex with" - it depends on your individual state. In many states, it is...
Why is this a problem for you? Is your cousin a bad person? Is your friend a bad person? If the problem isn't a safety issue then you should wish your cousin and best friend a long and happy...