I have long hair, but that's about it. I don't think most people associate it with metal though, because they keep telling me that I look like Jesus. Also, it seems to me that metalheads are more likely to be bald and have long hair.
I wear button up shirts though and I'm extremely outgoing and extraverted, so I probably don't seem like the "metal type" to most people. I do listen to and write metal often though, which I'm sure people can hear as they walk by my room, since I leave the door open, but I really don't like loud music very much, so it's probably not loud enough to bother anyone.
Metal's not the only thing I listen to though, as I'm extremely interested in ethnomusicology, so I listen to a lot of classical / orchestral, folk & traditional, and asian music as well. I do listen to metal the most often though and although I do write mostly metal, I take influences from the other stuff that I listen to as well. Basically, I want to write progressive ethnic fusion extreme metal.