Great discussion that's going on here, but I have to disagree with some of the repliers.
I don't think that for the most part, people only cheat for a "reason" but mostly it's because they can and it's available.
The fact of the matter is that WHILE we grab our partners and sort of "settle in" there's always someone more attractive, more better looking, more smarter, more cuter, and we'll ALWAYS find ourselves in more fulfilling encounters with other people that will MAKE us want to cheat.
In today's society, we CHEAT on our relationship partners become the bonds, parameters, and pre-set judgements that we put in place (this includes men and women) lead to a very LOW qualification process of a potential relationship partner, thus we see MANY QUALIFIED RELATIONSHIP PARTNERS.
See, most people will screw someone that they find attractive. This is a low qualification process.
Men and women must get to a place where they clearly demand more out of their partners other then ATTRACTION, when ATTRACTION is the FIRST thing that you look for.....you find MANY POTENTIAL PARTNERS. This is why we cheat so much, why we divorce so much, hell, there's just too many fishes in the sea with this qualification process.
But what if you wanted a girl with a specific talent, specific internal belief, etc? In other words, your own personal "the one." THEY say she doesn't exist, it's only because THEY don't know who their "the ones" are nor have they build that high quality qualification process.
We must build that process and like Anti-Dump, filter the field into we locate that women that fulfills our desires. This takes research on our internal selves, women, and how to identify the women of "our dreams."
It's like cookie cutter, when you take off your Don Juan masks, your Sosuave tips and tactics, who the hell are you at the end of the day and just WANT IN THE HELL do you want in a women? Write that down and obtain a compelling vision of that woman, research to learn more about the person in question, then when you go out instead of SARGING every chick you find physically attractive, look for the girls with the qualities of the chick you are looking for and SARGE THEM.
This is a higher quality relationship process, this leads to a longer relationship, a more fulfilling relationship, and more trust.
I believe this is the foundation to our INTERNAL JOY from our partners and also the foundation to LONG RELATIONSHIPS, family trees, and family foundations.