The following is sort of an answer to your question: the desert fathers (from the beginnings of monasticism) thought a lot about the beginning of sin. 

Sin has its origins in "logismoi," thoughts in our mind floating hither and thither, often from whence we know not. "Logismoi" is usually translated as "thoughts," though maybe in this usage it would be more suggestive to translate it as "distractions". Having logismoi is like walking the streets of Las Vegas, where promoters snap packets of prostitution flyers loudly across their hands and extend the flyers toward pedestrians. It is no sin to be assaulted by such advertising.

One may (at one's own risk) enter into dialogue with the logismoi to see what holds them together and to see how to help your brother (and yourself) tear them apart when need be.

Sin begins when one "couples" with logismoi, a condition described in depressing detail in our record of the ancestral sin:


  ... the woman saw that the tree was good for food, and that it was a delight to the eyes, and that the tree was to be desired to make one wise....
  (Genesis 3:6)


One might say sin begins when one seriously considers a wrong choice as an option. Our Lord spoke of this in His sermon on the mount:


  You have heard that it was said, "You shall not commit adultery." But I say to you that every one who looks at a woman lustfully has already committed adultery with her in his heart.
  (Matthew 5:27-28)


I say this is sort of an answer because it doesn't address the use of the word "temptation" in English as such. But I hope it helps illuminate how sin begins. 

In particular, Christ was, presumably, assaulted by logismoi as much as, and probably worse than, anyone else in human history. But He never coupled with them, so He never sinned. E.g. when tempted in the desert, Christ made it clear with His curt replies to Satan how little He thought of Satan's advances. 

More terrifying to consider along these lines was His struggle in Gethsemane. Perhaps it's best for me not to speculate on what was going through His mind then.

I think @ryan hit on the desert fathers' distinction. The logismoi are the "presentation" of temptations, and the coupling is the "feeling" of temptation.

What is temptation?
In Once Upon a Time when Regina became queen, how much did she rule over? Was it only the entirety of the Enchanted Forest?

How long/far did her power extend to? Did she own every single part of land in the Kingdom?
