Have you ever had unplanned sex with a friend (male or female) just because the situation and the mood was right?

Yes, this happened to me the summer after high school. She was probably my closest female friend in high school. We never dated or did anything with each other. But there was one night about a month before we went off to college when we were alone together and it just seemed like the thing to do. I didn't plan on it at all, but I also can't say I'd never wondered what it would've been like. I'll admit it did make things a little awkward immediately after, especially since we went to different colleges--but a few months later we met up and hung out again and we've continued to be friends. Nothing else ever happened; I just got invited to her wedding. It's just one of those things--I'll never forget it, but it wasn't meant to go any further.