Yes. It's normal
Of course if he's hot
Yes this action is extremely normal. Estimative ages 12-16 will think this way. But whose to say older age groups will not do the same as well? Just be carefull and be faithful to your partner.
Yes it is
Of corse it is!
Every human has good and bad parts in his mind. You may say it positive and negative thoughts. It is quite normal and not important. The important one is what part does your brain/conscience ask you to accept and go for practically.
Well sometimes it can happen. But don't let him stick in your mind as you love him!
That's perfectly normal. He probably wouldn't admit it, but I gaurantee he does. Every time he sees a good looking girl.
Yes it is normal. Aslong as you don't act on your fantasies and don't upset him by constantly telling him about what you think. We all think about other people!
Yes many people think about somone other than their partner and this is normal. If it is all the time though it may be a sign of problems in your relationship so it may be time to move on.