We have an 18 year-old daughter who wants to get her tongue pierced. We have been adamantly against any piercings for our son, and any that go beyond regular ear piercing for our daughter. We have, essentially forbidden this as well as tatooing. We feel it is a passing phase with more permanent repercussions. Today my daughter plead her case for having it done, saying it is something she wants and can do with or without our permission now that she is 18.She is a college freshman and is struggling with her 'identity' as such, and I think she thinks...