A lot of people lately have been criticizing evoltionary psychology, and with reason. Many of the ideas expressed are nothing more than stories made up after the fact to explain very specific behavioral phenomena. However, not all evolutionary psychology is worthless. Since a lot of evolutionary psychology has to do with gender and reproduction, particularly the parts that get criticized, I will focus mainly on that subject area.
 A gene is more likely to be passed on to the next generation if it results in a trait that confers a reproductive advantage over those lacking the trait. Over time, this results in a change in the gene pool, known as evolution. One of the most potent reproductive advantages among sexually reproducing organisms is mate selection. This is particularly true among humans, as we do not have any natural preditors or competition for resources besides humans, and among modern humans the competition for resources is not that fierce. This leaves competition for mates as the primary evolutionary force among us.
 It is important to keep in mind what can and cannot be passed along geneticaly. A lot of amateur evolutionary psychologists confuse memes and genes, which are two very different things.
 A gene is a snippet of genetic information that codes for a specific trait, and is spread through reproduction. Its rate of spread is limited to the reproductive advantage it yields, which means that a gene that gives a large advantage will spread far faster than a gene with just a small advantage. A gene that gives a 10% reproductive advantage to those possessing it (which is huge, think dietary adaptions to agriculture) will be 1.1 times as common in each new generation than the generation before, on average. This means it will take approximately 7 generations, or about 150 years in humans, for this gene to double in frequency. From the time the gene is introduced to the time it is expressed in half of the population will take 20 to 30 generations, or in the case of our hugely advantageous gene, 30,000 to 50,000 years. This means that it is unlikely that any significant evolution occurred since the invention of agriculture, except among genes that were already fairly well established before agricultural times.
 A meme, on the other hand, is an idea that can be spread from one person to another. Memes be adopted very quickly in a society, and can give a huge advantage to those who adopt it. One good example of this is agriculture. It is important to remember, however, that the adoption of a meme is not a genetic adaption, despite the fact that is improves the fitness of the individuals who adopt it. Humans who adapted agriculture were gentically the same as those who didn’t but those who did adopt it had a huge reproductive advantage and perpetuated the meme.
 Most reproductive adaptions in humans probably occurred before the introduction of agriculture.This means that any evoltionary psychology focusing on modern situations as leading to adaptions should be scrutinized very carefully to see if they would confer enough advantage to become prevalent in the population, taking into account how common that gene would likely be before agriculture and thus how many generations it would take to become common.
 One last thing to consider is how the gene would be passed down. If the gene confers a reproductive advantage, you need to consider that it is probably not on the sex chromosomes (as that is not where most mutations would occur) and that it is therefore probably shared among both genders. This means that it would most likely be triggered hormonally by testosterone or estrogen/progesterone, and therefore would express in females with high testosterone or males with high estrogen/progesterone. If this is, in fact, observed, the hypothesis may well be true. If it isn’t, the common trait is probably memetic and not genetic.