Well, even body piercings don't actually go away. So I think if you do the ear loops you need to have surgery to restore your earlobes back to a "hole-less" state if you want at a later time. I have a friend who did that, actually.
I had/have a couple piercings and I thought they would be "temporary". But they aren't - I still have a hole from the belly button ring and I doubt my nose ring hole will ever close up (though I still wear that piercing). I have a scar on my tongue but nobody ever sees that except my dentist.
After a certain period of time the body piercings do become permanent, just like piercing your ears.