In dealing with the accounts of Roman emperors you have to take some of it with a bit of skepticism. We can only rely on a very small sampling of very biased contemporary writers. The contemporary histories we have access to were the political propaganda of its time. These writers were not above delving into personal slander. Sometimes their objective was to savage previous emperors in order to show how great the current one is, especially if those past emperors were from rival families. Nero was despised for his affinity for Greek culture over Roman culture. A lot of the tales about him were exaggerated to get across the point of the superiority of the Roman over the Greek.
“Nero was despised for his affinity for Greek culture over Roman culture. A lot of the tales about him were exaggerated to get across the point of the superiority of the Roman over the Greek.”
This may explain why the man Nero was said to have married and had public sex with, was a famous representative of Greek culture, Pythagoras, who had died over 500 years earlier.
Or it could have been another guy named Pythagoras, from down at the bath house.