Str8 bros: How do u view other men?

I am a bi guy. And I would really like to know the perspective of straight men. When it comes to observing an attractive dude, are you able to tell he is good-looking? What exactly do you see/feel? Do you look at another guy the same way you would see a piece of furniture? Is a gorilla considered the same as a dude to you? Lastly, what repulses you towards men? Is it their scent/smell or beard? Or feet? I really want to know what a totally straight dude feels when he sees another dude. I appreciate genuine responses. Thanks.