When I take a shower, I'm going to make sure to unlock the door so my teenage brother can walk in on me.
I feel like that's inappropriate. Why do you want him to walk in on you?
I think my teenage brother would enjoy a view of my naked bod.
It is not okay for you to be seen by your brother nude, and it is wrong of you to want it as it can be seen as incest. If you are think of your brother sexually, you should get help from a professional as that is not something that you should be thinking.
I don't support incest, I'm just curious and wanted him to see my junk.
It is not a good thing for him to see you nude, and it is not okay for you to be curious or for you to want him to see it as it will probably be traumatic for him and will cause him harm. I suggest that if you are really curious, try to do it with someone that is not a relative an would consent with you being naked around them.