I'd say being an adult kissing a 15-year-old is a pretty common sense boundary not to cross.As for the law, your question can best be answered by going to the link that I have provided:  http://www.nycagainstrape.org/survivors_legal.htmlThis site will outline what behaviors can land you in trouble.   Make one mistake and you are committing a crime.  You are playing with fire here.  Seriously, stick with someone your own age.