Is it normal not to be turned on by looking at men?

Im a straight girl. When I look at random really good looking men, I never really get turned on. I'll notice that they're good looking but it never turns me on. However, when I see my boyfriend, (who I find attractive but I know he isn't exceptionally good looking) I get turned on because I know what he can do in bed. I guess I'm just not a visual person. Is this normal?