Is it normal to be straight and sexually aroused by women sometimes?

I noticed that whenever I see sexual pictures of women or in a sex scene when a woman starts taking off her clothes, I sometimes get a tingly feeling down there (arousal). And in the Black Swan movie when the girl was giving the other girl oral, I got that feeling a little as well. I dont want to be with another girl sexually, but I do find the female body much more beautiful. I find a man's body (when completely naked) kind of weird looking. Especially because I hate body hair. I do get attracted to their body when they have tight clothes on and are muscular though.