Do you only see the angels in your sleep?

Sometimes when we try to not think about certain things we end up thinking about them more (e.g. Don't think about zebras). I've found that my dreams often develop of things that were crossing my mind as I was getting drowsy so maybe try to think of positive things.

As for the sexual dreams, it is completely normal. I (a male) never have had a sexual dream, but many of my friends (both males and females) have told me they've had them through their teenage years.