This could mean taking on a role outside of their comfort zone, choosing to "zig" when film audiences expect them to "zag," and, yes, sometimes deciding whether or not to do a movie that requires them to film in nothing but their birthday suit. Baring it all for the big screen may not seem like a major deal today, when so many folks are living what used to be considered private moments across social media for the world to see, but not everyone is so comfortable getting naked for public consumption. Factor in the idea that a nude scene will be projected onto an enormous movie screen where every inch of one's body can be critiqued, and, well, it's enough to make any actor say, "Thanks, but no thanks. And not everyone who bared their bods for a role did so at the start of their career to gain attention; many took the plunge well into their resume of on-screen credits just because it felt right. Check out these 15 celebs who boldly went where not every actor has gone before.