If they are both 18, no problem. If one is underage and the parent has given approval, I would worry if something went wrong and the approval is withdrawn and the cops are called. Could have a negative impact on the gym. "CHEERLEADING COACH ARRESTED." The headlines at a one prior gym we were at involved a 20-something year old and a consenting 16 or 17 year old. He only served a few years. I guess he did not have to register as a sex offender because it was consenting and he pled guilty as there was evidence in writing. Now if I was a parent at that gym (and not the parent of the athlete involved), I would view it negatively and it would impact my thoughts towards the program. But I am a stick in the mud that way.:D It was so awkward explaining to a elementary age child why her cheer gym imploded.