I have naturally STRAIGHT hair. And I use all caps because nothing short of a nucluar warhead will get my hair to curl and stay that way!!!
I *really* wanted spiral curls in the 7th grade, so I tried getting a perm and ended up with icky wavy hair for about 3 weeks until it wore off.
I'd have to say straight hair on guys looks really good (as long as it's well kept of course!)