In general, I can accept that theory.While I admit this is a generalization it is also a
fact that the view the western world is more liberal
in their attitude towards free and casual sex is
generally accepted as a fact among non-whites.
That inevitability contributes to the biases on
westerners' sense of marital fidelity.
The one part of yomero's statement which I find most difficult to accept is when he says that "white people get tired of their spouses more often and more quickly".
Maybe westerners are more prone to infidelity, as you say, but it does not mean that in other cultures they do not get tired of their spouse as often or as quickly but just don't act on it.
Because of that, I still say his statement has next to no merit, same as assuming someone's race based on how a "post is written". How does one differentiate an articulate Asian or Black from an articulate WASP? Or inarticulate individuals from different races.