Here, I will explain THE REAL reason why its called port and starbord.
Many centuries ago, when the Portuguese started sailing, they thought the world was a cube. They started sailing South along the coast of Africa, and as they headed South, land (port) allways stayed on the left side of the boat.
Portuguese word for it BOMBORDO (good bord) but the English, and the Dutch (and the French with the arrival of beneteau, LOL) that started sailing MUCH later, modified it to Portbord.
The other side, was the ESTIBORDO (Side of the Stars), and the English started calling it Starbord.
Remember the Portuguese (and some obscure Spaniards) were the first to sail, record and write about it (not the first because teh Fenicians, the vikings all sailed, but never wrot nothing, or wrote little).
Cartography started in Portugal and Italy (when some Portuguese moved there).
As for the head, the portuguese word is Sanita (sanitary), because when doing the DO people belived they were sanitized thru their poo hole.
Why the British started calling head??? Each one poos from where he "bloody hell" choses.
The port satarbord thing we learnt in school, the head I was just joking.