Wow, I really appreciate everyone taking the time to reply and crafting such great responses. Thank you so much. Let me see...
DH gets turned on by the idea of me having sex with other men, yes. He would probably like to watch in the future. He would prefer it if I slept with strangers but we agreed I could start off with someone I know. My friend was there, he was safe, he was (somewhat) willing...but now I see that just because he was there for the taking didn't mean it made things easier. Otherwise, my marital sex life is great and passionate. I'm open to DH having sex with other women, too, but we're starting out slow. It is extremely difficult for me to be attracted to a man whom I don't know because I care nothing about a man's physical appearance. longun45, thanks for sharing your past experience.
We aren't close friends, so I didn't think it would be so tricky. I just didn't think, I guess. I believe I need to have some kind of discussion with my friend right now. I can tell him I enjoyed the sex, but we by no means have to do it again if he doesn't think it's a good idea. We have started talking again, but about inane things, and have ignored the subject of sex at all. I will keep the board posted.