I am not licensed to practice law in Tennessee, but the parental approval does not trump Tennessee law on the age of consent, which is 18 in Tennessee. It matters what you mean by dating, too. If dating means no sex of any sort whatsoever. it may be OK. I would suggest you simply wait until you are 18, as tough as that sounds because it can be dangerous for your boyfriend. If you really care for him, tell him to wait.
If this relationship continues, the 20 year old could face criminal charges that will have lifelong detrimental consequences.
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