Question: When I am eating a meal alone and that meal includes bread what parts of the Birkat Hamazon do I pray? Which parts do I exclude? And please be specific. (I use the Schottenstein Artscroll siddur hachol.)

Answer: 
**UPDATE**

The question was edited to add the reference to the fact that when the Yetzer Hara was totaly eliminated, chickens stopped laying eggs. This means that the general concept of "lust" means that there is a desire to actually do or accomplish. This means that without the drive that we have, people cannot accomplish anything in this world. If we never felt hungry, we would starve to death. Thus, without the "lust" that we feel, we would never get married in the first place. An example can be see in the writings of [Rabbi Shmuley Boteach](http://www.jpost.com/Opinion/Columnists/No-Holds-Barred-Kosher-lust-346358) as shown in the example that I linked.

**Original**
This is discussed in many areas for example, Rabbi Eliyahu Dessler in [Michtav Me'Eliyahu](https://en.wikipedia.org/wiki/Eliyahu_Eliezer_Dessler#Michtav_me-Eliyahu) in Kuntras Habechirah, (Michtav MaEliyahu, Vol. 1, page 111-119) explains that everybody is given free will in order to be able to raise himself to whatever level that he is capable of reaching. If a person was only attracted to one person, they would not be able to resist behaving inappropriately nor would it be a matter of free will. Similarly, if one "*mated for life*" and never felt any attraction to another, we would be no more than animals in this respect and would not deserve reward or punishment.

While this is one of the greatest tests, it is still no different (in essence) than feeling a desire for non-kosher food.

See also [Michtav Me'Eliyahu](https://en.wikipedia.org/wiki/Eliyahu_Eliezer_Dessler#Michtav_me-Eliyahu) as well as

> 
> [Michtav Me'Eliyahu](https://en.wikipedia.org/wiki/Eliyahu_Eliezer_Dessler#Michtav_me-Eliyahu)
> 
> 
> One well known idea of his, expounded on in Michtav me-Eliyahu, is the
>  Nekudas Habechira (point of free will). He states that a man has one
>  point in his service to G-d where he has to fight his evil
>  inclination, while at other points there will be no struggle, for the
>  levels below his Nekudas Habechira have already been conquered,and he
>  will easily win those battles of will; whereas levels higher than his
>  Nekudas Habechira are not yet within his grasp. (For example, someone
>  who adheres to Orthodox Judaism will have no problem keeping kosher,
>  but may sometimes be tempted to rely on unreliable kosher supervision,
>  while somebody farther away from religious practice will have to
>  struggle with whether to eat a ham sandwich (which is non-kosher
>  regardless of supervision).) Each time one defeats the evil
>  inclination by choosing to do good over evil, his Nekudas Habechira is
>  raised a bit higher, and that choice will be easier for him to make in
>  the future. Consequently, Man's task in life is to consistently raise
>  his Nekudas Habechira, thus growing ever greater in his service of
>  God.[1]
> 
> 
> [1]Michtav me-Eliyahu vol. 1 pp. 113
> 
> 
>
Why does G-d tempt us? 
To reward us when we do good.

The 'Sahtan' (aka Satan) is an agent of G-d who puts challenges before you and hopes you will over-come them and he, that angel who brings temptation, rejoices when you over-come the temptations.

If you're going to be given an infinity of reward for something, the harder the task, the sweeter the reward.

Nobody every got any happiness out of something that was just given to them, including the lottery. There is no joy in that, the recipient doesn't have the inner muscles to handle it. 

Imagine a billionaire father who wants to give each child 500 million dollars.

Make your bed! the father demands.

You make your bed. 

OK, here's five million dollars. 

Just for making my bed? That's too much? 

The more you do for the 500 million, the happier you'll be.