Should I use and / or

Please tell me whether the following sentences are correct or not.

1. I dont want to see Mary, John and Peter. (I dont wnat to see the three of them   at the same time.)
2. I dont want to see Mary, John or Peter. (I dont what to see any one of them.)
3. Avoid eating fish, beef or pork.       What does this mean?
4. Avoid eating fish, beef and pork.     What does this mean?

Thank you.