mmmm "...just once, for old time's sake?" LOL. Yes, of course I have. I have one particular ex that is still really a great friend - we had wonderful a affair but were just too different in too many ways to be a long-sting couple: we had bcome a couple i high school because everyone "expected us" to - we were physically a very attractive couple, with a few things in common- so we dated and eventually started having sex. That sort of sealed the deal for a while - we were a "normal" couple doing "normal" things together that felt really good. I think we both knew all along that we would not be a long-term couple, but the relationship saved us from having to worry about the whole "dating thing" in high school and for my first year in college - we liked each other, and loved fucking each other.
The reasons we split are many - scholastic stuff, political stuff, other guys interested me, other girls interested him -- the usual.
But he is still an awesome friend. We see each other now and then, especially when I get home for some reason to visit. We'll go out for dinner or something, and there is still that "muscle memory" of how nice it felt for him to be inside me .. and I invite him in.. or I give him a bj ...
It felt great back when we were a couple, and it still feels great now. I know we'll probably stop when being together will be one of us cheating, but right now we're in the clear. I will never go out with him as his girlfriend, and I could not ever think of being his wife ... but I sure do enjoy being his bed partner....once in a while...