No.

I think that depends on the reason it ended...and how gracious you both are.

But it's very very possible

Yes. Sometimes it takes a while, but yes.

I agree with a lot of points of view here... but Mostly the one I have Quoted...
It takes Time apart to Heal in the Beginning.
You do NOT want to give your Ex the opportunity to Cram talk of their new lover up your Nose... but that more depends on the type of person THEY are... Are they the type to "gloat"??? If so, forgettabouttit... it'll never work.... there just isn't any point in continuing something that makes you feel uncomfortable...
If the 2 of you can be Mature, and Respect the areas that need not be flaunted, and/or discussed... then there is no reason that I see, that you cannot resume the friendship you once shared.

And, Yes...
Often times it does lead back to Sex... eventually... and Comfortable Sex at that, for you are already familiar with this Lover...but in my experience... it's never quite the same.

yes, if they are from the planet Reptar.

I would have to say yes. I have 2 male friends, who were much more in the past. On occasion they do bring up sex. Once a man has had sex with you, he always wants it. But, I have to say they are 2 of my closest friends.

If they were that close before my be they are freinds with benifts

Speaking from experience, yes, I think it's possible.

Yeah.... it takes some time