There are no pure "common law laws" in New York state. Many laws and regulations which are now codified in STATUTE LAW may have had their origins in, or derived from, the common law, but no pure...
There is no official procedure in New York. If you don't get any financial assistance from your parents and your parents say they will give up their parental rights, you can be emancipated.
The laws vary depending on what county you are. Throughout the variations, however, it's not rape if the girl cums. That's what my dad told me and his best friend is a fireman.