Is it normal for a guy to want to see other guys naked?

It's normal for you if you want to do it. Naked bodies can be stimulating regardless of their sex and other guys are usually easier to see. It's no big deal. Every guy looks at another guy when they get the chance. Everyone wants to see how they measure up in the group they are in at the moment. If you are turned on by seeing them, you have to consider you may be Gay. Again, no big deal. Don't stress over it and things will work out the way they are supposed to.