For anybody looking for something to write about...

I had a random person IM me on AIM. They asked me the following question, and I would really actually like to see my f'list answers to it:

What makes a relationship a relationship, besides sex? How is it different from a friendship?

I was asleep when the IM came, so I never responded, but once I'm finished with my current streak of "stuff to get done ASAP for work" I'll probably piece my own answer together.