Self-mutilation may be a sign that something ain't quite right. Ya think? I'm not scared of people with this problem, but I'm concerned for them. Much like meeting someone who is anorexic. This doesn't engender fear in me, but empathy, as one human being to another.
Its a sign you may or may have had big issues. On the other hand I knew a girl who used to do it for fun and was pretty normal. I guess it all depend son the guy. Hurting ur self is not a big turn on for me and I would think its a red flag.