Dating is not legislated. However, why would an 18 year old adult want to go out with a girl in Junior High School? There is only one reason, and sexual contact of any type is illegal and could land the man in jail.
I highly disagree with this answer. It is corect on the point that dating is not legislated. However, there could be multipule reasons why an 18 year old would want to date a 15 year old. Not every relationship is based on sex and if they feel that there relationship can withstand having NO sexual contact. Then there is no reason why they should not be able to date.