Genetics and Predisposition to Sex

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Genetics are what make every single human being on the face of this earth unique and special in their own little way – all seven odd billion inhabitants and counting.  Some people are short, some people are fat, tall, and some people can’t throw a baseball at all – look at Olympian Carl Lewis, or more recently, rapper 50 Cent – they both made cringe worthy attempts at the traditional first pitch of a baseball game.  On the ladies side, singer Carly Rae Jepsen fared no better than the boys when she threw out her first pitch.  She sure did look good trying though, and it is not her fault – it is all in the genes – kind of like the attraction one might have for Carly Rae, or Carl Lewis, for that matter.  Others might be more inclined to spout out Dr. Suess like rhymes at the drop of a hat, or something like that.  New evidence also finds that human beings have a genetic predisposition to the friends they choose in life, linking olfactory genes connected to the sense of smell.  That being so, genetics must also play a vital role in how an individual will choose a sexual partner – meaning human beings have a genetic predisposition to sexual attraction, mating, marriage and procreation.

In the scientific realm, genetics is the study of genes, heredity and variation in living organisms, and how traits are handed down from parent to offspring.  In the observation of organisms, science has shown that inherent traits are formed by units of inheritance, referred to as genes.  Today’s genetic scientists have come a long way, not only in the observation of genetics, but also in the function and behavior of individual genes, observing portions of DNA (deoxyribonucleic acid) that represents cellular function or process. Hence, how one individual can effortlessly throw a baseball compared to someone who could not if their life depended on it, and how an individual has a predisposition of sexual attraction to one individual and not another.

A recent study out of the University of Colorado found that individuals are more genetically similar to their spouses than they are from a random selection of individuals in the same population.  It is common knowledge that people tend to marry others who share similar characteristics like religion, age, race, income, education, and so on, but what was unknown before this study is that people also choose a mate based on DNA, or genetics, something that is inherently a part of the subconscious – a simple stroke of the genetic key that makes a person choose the best possible fit for mating and inevitably, procreation.

The study examined the genomes, or the genetic material of 825 non-Hispanic white American couples, according to ScienceDaily, specifically targeting single-nucleotide polymorphisms, which are places in their DNA that are known to commonly differ among humans.  Findings revealed that there were fewer differences in the DNA between married people than between two randomly selected individuals.

There are other studies, like with the recent research linking friendship to genetics that also directly correlate smell to sexual attraction and an overall genetic predisposition to sex.  Men and women often find pleasure in different smells, but those tendencies and preferences all connect men and women to sexual attraction. In one study, according to Google, a group of heterosexual females smelled the perspiration of different men, showing that there was a preference for some over others, further proving the compatibility of genes in potential sexual partners.  Elaborating on these findings, MCH (major histocompatibility complex) genes that help regulate the body’s response to pathogens – viruses, bacteria and other harmful organisms – are better at protecting the body when a person has different MCH genes in their DNA.  This concludes an evolutionary advantage when two people with a different set of MCH genes procreate, that the offspring of those two people would inherit MCH genes from both parents, ultimately making that individual stronger and more apt at fighting off disease because they are more well-rounded and have more MCH genes.

Call it destiny, fate, love at first sight, God or just plain human nature, one thing is for certain, human beings are set up for sexual success, and without a shadow of a doubt or the aim of Cupid’s arrow, genetics provide a predisposition to a person’s sexual appetites.

By Justin Williams