Is it normal to have wet gay dreams and be straight?

Every single night I have this dream, its always the same. In it I am walking down the street when a very thin man walks past me. For some reason, I get tingles when I see him. I then follow him to an alley where I thrust him against the wall. I then give him a long and lustorous kiss. As I slide my hands up and down his body, he takes off my shirt. Sliding down his waist, I pull down his pants and briefs, I then begin stroking his long, thick penis. He asks if what we are doing is wrong, and I say that I honestly dont know, but I like it.
This is the end of the dream, and when I wake up I am wet and hard. Is it normal if I have always been straight and never have thought of a man in that way?