speaking of amazingly small spaces

If I ever commit to life in a big big city, i want to live in a place like this:

So in my last post I referred to the fact that when I was 35 and single that I'd live in a tiny house. Does one have to be single to survive in a space like the tiny ones I've shown? I'd like to think not, but would you kill someone if you lived in a space that small? I mean, it's not like you're there all the time, right? I survived dorm life in college so it's doable right? thoughts?