natashab,
You shouldn't really be concerned about what we think. Have fun with it. Enjoy. Tell us about it after it happens.
I personally don't go for the whole ****-buddy thing....the reason is that I learned very early on that I cannot separate sex from emotion. I may have thought I could, but I can't. So if I'm going to be intimate with someone, I do not want to hide the fact that I have feelings, or that it is possible that feelings might at least develop.
But that's just me.
I do have girlfriends who are into that sort of thing and have far more liberal attitudes towards sex than I do. I sometimes wish I could be more emotionless with sex, because then the sex-less times in between relationships wouldn't be, well...so sexless.
But since you've been in so many long term relationships you haven't even really explored this whole notion yet, ever. So you should. It seems quite apparent that you want to. So go for it.
But be honest with yourself.