According to the article, Why you'd be stupid to cheat on your wife: Unfaithful men have lower IQs, say scientists, those men who are not faithful have lower IQs than those men who are faithful. They say that it all stems from evolution. In the past, polygamy was a common practice. As evolution took its toll on human development, polygamy has declined. Thus, "sexually exclusive relationship is an 'evolutionarily novel' development for them [men]." According to the article, more intelligent people are more likely to partake in "new practices".
The article didn't provide any actual data or findings from the study, so it fails the fifth scientific principle in our text book, "Extraordinary claims require extraordinary evidence". All that the article said was conjecture based on theories and claims without actual data or findings. Thus, without extraordinary evidence, or evidence of any kind to support the extraordinary claim, the study fails to provide an effective argument.
The statistics provided in the article detailed the intelligence of people (both men and women) who are either religious or not religious. While there may be a connection between conservative ideas and liberal ideas and "new practices", this study doesn't provide evidence to prove such a connection. Even so, if there were to be a connection, the evidence is still based on correlation implying causation which isn't the case. It could be true that a third variable, perhaps life style, that causes an increase in infidelity. If a family is constantly in turmoil, then relationship conflicts will cause decreased happiness; thus, increased infidelity. It also so happens that people with a lower IQ tend to have less fulfilling careers, a major cause of lower-income life styles. It is also not out of the question that people with higher IQs just don't get caught as often.
Read more: http://www.dailymail.co.uk/news/article-1254420/Men-cheat-wives-intelligent-faithful-husbands.html#ixzz1ZfnI4zPd