Hrm.
Honda made an "Aero 50" little scooter, and several 750s but none "Aero".
Honda Shadow Aero 750
Its a cruiser (V-Twin). Nice looking bike.
Gas in the oil isnt a "normal" sign. If the bike is new I would just make use of the warantee and take it to the dealer to sort out. Otherwise I would change the oil and ride it for awhile and check again later. If it still smells like oil then it could be leaky rings or a carburator in bad need of adjustment (you would probably notice the carb problem with some bad handling). If the performance of the machine isnt effected it isnt an "urgent" problem, but if it continues its worth looking at.