To me, Sx-firsts tend to fall in love quickly and fall out of love just as quickly. Since they're passion-driven and have huge expectations they tend to idealize the people they have strong feelings for, and the return to Earth is often brutal - especially since they're often attracted to people they have little in common with.
They typically have no problem entering a relationship as they know their game, but they have major issues staying interested in the same person on the long term.
Sx-lasts on the other hand seem to be more rational when it comes to intimacy. They get fewer relationships, but each has a higher chance of being lifelong.
Due to this I suppose I'm Sx-first but focused more on activities than people.
If I was a Three or a Four I guess I would answer "interesting" indeed.