I think you can tell something about people from their choice of bedsheets.
So - what do you slip your tired body between? Egyptian cotton with the highest thread count? Good old fashioned flanelette? Those 70's porn-style fake-satin sheets? Scratchy slippery nylon? Or don't you care two hoots so long as they're clean?
(Mine are highest quality cotton. And white. With a bit of lacy or fancy edging) That is because I am a very pure high quality person who likes the odd bit of frippery ..... :-)
I prefer cotton. I have about 5 sets of bedding, in different colours that I can swap according to my mood. I like pale blue best.
Flanalette is a bit old fashioned isn't it? I remember these from when I was a child. Candystripe things that helped to keep you warm in winter.
I prefer the left side - but usually sprawl spreadeagled and take over the whole bed. When the BF stays over, he likes the left side also (something to do with he being left-handed and wanting 'easier access' - whatever that means....!!!) I do relent at my house and let him have that side.