I don't think it's a simple as getting aroused when you see a naked body at all. People have lived for generations completely nude, and don't think anything of it. You do not automatically get aroused at naked bodies unless your own mind is conditioned to take you there. It can be unconditioned.

And to the people who said walking around nude leads to strange sex practices. So what if it does? Strange is the term that we give to something that doesn't happen very often. There doesn't mean there's actually any harm in it. And if you note, "doggy style" (sorry didnt know a more pc term), which can be actually considered a form of deviant sex by some religions, is actually our bodies most compatible position for having sex, just like it is for animals who have anatomy in similar positions.