Once Aaron had woken up from his slumber, he immediately headed to the Chronivac to make additional changes. He had seen his new reflection long enough to notice that he looked off with his 18 year old head and neck on top of his father's masculine body and wanted to use the device to fix this mismatch.
After scanning the Chronivac for a solution, he stumbled upon the option 'Neck-up swap', which was the opposite of his original swap. With this choice, Aaron could switch his head and neck for someone else's but keep his brain in the new head. Thus, he could replace his head and neck without losing his manly body.
Now the only problem was who he was going to choose. He could pick his father and complete the swap, or he could select another man, giving himself an entirely new identity. With the Chronivac, the benefits were endless.