When sharing a bed with one other person, do you have a preference for a particular side? I know that when there is physical intimacy involved, I definitely have a side preference, which involves convenience of dexterity. If you have a spouse/partner, how did you negotiate your regular arrangement?
By “right side” or “left side”, I mean that, lying on your back, that is the side of your body closest to the edge.
Left, at least in this house. My wife gets up more often than I do during the night and her side is more of a straight shot to the bathroom. In the RV, it’s the right side because of leg room. In hotels, it’s bathroom driven.
In my experience, I’ve found that women prefer the side that is closest to the bathroom, so I let them have it.
My husband is 6’10", so he sleeps diagonally on our king-size bed. I take whatever space doesn’t have a cat on it.
Left side. Wife and I have just been doing it that way forever.
20 years with my Wife and I take the left side. Same house the entire time. I am closer to the bathroom, but not by much. She has her alarm clock, I have mine (well just my phone now).
At hotels I seem to end up on the other side. Just seems to be the way rooms are laid out.
The lady of the house runs hot, so she always sleeps on the side closest to the window, whichever side that happens to be. When we’re at home, that’s left side for her and right side for me.
Hubby gets proximity to windows, since he sleeps hot. I get a collection of large, black dogs, also known as assassin dogs. They blend really well with “night”, and they’re very silent. After you fall over them, they look at you accusingly and then go back to sleep. A win for almost everyone. 
Hubby takes the side closest to the door and that puts me closer to the window, wherever we are.
Left because I’m not given a choice. I prefer to be farthest from the door, so that home invaders/monsters/ninjas get her first. Before that was true, we recently moved beds and now it’s not.
Mine are like that except not black, and not silent. They say URK, AWF when you trip over them, and scrabble to get away. Over the years I have become inured.
I don’t have any preference, and I’m not sure there is any rule with me and my wife. I think I tend to sleep on the left side, but it’s not a rule. I’m not sure it occurred to us to have a preference. At her condo when we were dating, I think I tended to sleep on the right side. Neither were a question of proximity to a bathroom or a wall abutting one side of the bed (though in beds that are against a wall, I tend to slightly prefer being “inside,” so against the wall.)
Left side. We’ve been doing it that way for 39 years and counting. Bathroom doesn’t matter - in this house I’m closer, in our last house she was. In our first place we were equidistant.
I never liked having “his and hers” sides of the bed.
I would alternate. My wife went along with it for a while, but then settled into the left side (looking at it from the foot of the bed) side. Now that’s her side. Guess that makes the right side mine.
Since I have acid reflux and need to lean only to the left, not my right side, I go with the right side of the bed.
I said “either side” but it’s actually far more pernicious than your selection allows. Left on my own, I will sprawl through the center, leaving not a corner undisturbed. But if I’m with a partner I become a very aggressive cuddler.
Now don’t get me wrong, I do understand those groans vibrating through the interwebs. I get it, and fully respect his right to get a decent night’s rest. But once I fall asleep all bets are off. I will be laid right beside him and fully cuddled up within minutes of dozing off, apparently. I’m told there is no escape.
So the answer is not “either side” or “any side” but “I"m pretty much going to be wherever you are; might as well save your money and buy the smaller mattress.”
:o
Woman here, but my side is away from the bathroom. Not because anyone goes more frequently, although that would be me, probably. But because I am claustrophobic and our bedroom has no windows and I need to see the outside. There’s a sliding glass door to the backyard on the opposite side of the room from the doors to the bathroom and to the rest of the house. I get the side of the bed closest to the light from the outside.
So, a proper (unspread) hammock would be ideal?
Or role-playing you’re Luke and they’re a Tauntaun.
The side closest to the window and fresh air. Hot flushes, yannow!