Questions about sex

Me and my friends were talking about how we really don’t know anything about sex and are worried about when we each get married how we will know what to do. So we have a few questions.

1. Does it hurt?

2. What is the difference between him busting nut and cum?

3. How many times does it take to get use to it?

4. What do people mean when they say they have “rounds”?

5. How long should it last?