I've had very few encounters in my life that would count as one night stands. They were all in my youth, they were mostly with women, and I didn't much like them. It is entirely possible to have casual sexual relationships that aren't one night stands. Trust and respect are absolutely essential for me in picking a sexual partner, which pretty much rules out people I don't know at least as friends.
And I'm not sure what you mean by going from one guy to the next whenever I wanted to. I have had multiple sexual partners over the course of my life, but I do not typically have multiple sexual partners all at once. If there's someone I'm ing, whether it's for a period of a few weeks, a few months, or a few years, they're the only person I'm ing. I'm not bouncing around from one person to the next on different nights of the week (though, frankly, I don't see anything morally wrong with that, either, so long as everyone involved is careful and honest). So, if that's what you mean by going from one guy to the next whenever I wanted to, I would also feel weird about that, personally.