I actually had to look to find this out!
How strange that I did not know this!
Mine is an INNY and no, why would I change it...innnies are the nicest, but then again, who sees it nowadays anyway - I don't wear a bikini so it is rarely likely to show.
Perhaps when I wear a short top, it could sometimes show but I mostly wear long tops to hide the tops of my legs!
Oh!! I never thought of that . . . . an outie can be made an innie but how would the other way work? LOL. I guess people prefer innies. I think outies happen when the umbilical cord is tied off too long.