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Some textual variations may have been made during the recording of this podcast. Sex is back—with the movie Sex and the City opening this week in New York City to record-breaking crowds. So, what better time to look at an interesting effect of sexual images. Men who watch a video of bikini-clad women or fondle lingerie are apt to be more impatient to receive other scientific american dating service stimuli, like money, candy or even soda—according to research published last week in the Journal of Consumer Behavior.
Three studies included a total of men, from 17 to 39 years, scientific american dating service. After seeing pics or videos of sexy women or handling a bra, men consistently preferred immediate gratification: They chose to receive a small sum of money right away, scientific american dating service, over receiving a large sum later.
Previous studies show that erotic stimuli tap into the same brain circuits as money and drug rewards do. This research further supports the idea that one stimuli, sexy images, can leak into a craving for different stimuli, like money—at least in half the human race.
No similar effects reported for women…yet. I mean Sex and the City 's Samantha starts stuffing her face with guacamole after ogling a sexy male neighbor in the shower.
Then again, Samantha is considered the most masculine scientific american dating service the four female characters…. Subscribe to this Podcast: RSS iTunes. Already a subscriber? Sign in. Thanks for reading Scientific American. Create your free account or Sign in to continue.
See Subscription Options. Watching women in bikinis tends to make men more impulsive when it comes to monetary decisions.
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Afterward, the amount of the radioactive isotope carbon in their remains decreases. Measuring carbon in bones or a piece of wood provides an accurate date, but only within a limited range. It would be like having a watch that told you day and night. Also called single crystal argon or argon-argon Ar-Ar dating, this method is a refinement of an older approach known as potassium-argon K-Ar dating, which is still sometimes used.
Both methods date rock instead of organic material. As potassium decays, it turns into argon. But unlike radiocarbon dating, the older the sample, the more accurate the dating — researchers typically use these methods on finds at least , years old. While K-Ar dating requires destroying large samples to measure potassium and argon levels separately, Ar-Ar dating can analyze both at once with a single, smaller sample.
The uranium-thorium method is often helpful for dating finds in the 40, to ,year-old range, too old for radiocarbon but too young for K-Ar or Ar-Ar. Over time, certain kinds of rocks and organic material, such as coral and teeth, are very good at trapping electrons from sunlight and cosmic rays pummeling Earth. Researchers can measure the amount of these trapped electrons to establish an age. But to use any trapped charge method, experts first need to calculate the rate at which the electrons were trapped.
This includes factoring in many variables, such as the amount of radiation the object was exposed to each year. These techniques are accurate only for material ranging from a few thousand to , years old — some researchers argue the accuracy diminishes significantly after , years.
Silicate rocks, like quartz, are particularly good at trapping electrons. Researchers who work with prehistoric tools made from flint — a hardened form of quartz — often use thermoluminescence TL to tell them not the age of the rock, but of the tool. After shaping flint, toolmakers typically dropped the rocks into a fire. Archaeologists also frequently use TL to date ceramics, which are also exposed to high temperatures during manufacture. Similar to TL, optically stimulated luminescence measures when quartz crystals in certain kinds of rock last saw sunlight.
That emitted light, the signal, can be used to calculate when the sample was last exposed to sunlight. ESR, which measures trapped electrons using magnetic fields, is related to magnetic resonance imaging, the medical technique that allows doctors to look for tumors or peek inside your creaking knee. They found an inverse correlation between MHC similarity and attraction score. Since that time, studies in human beings have yielded mixed results.
The most persuasive data come from an investigation of Hutterite couples in North America who appear to display nonrandom MHC assorted mating preferences. But this correlation—giving genetic matchmaking the benefit of the doubt—establishes at most a natural preference, and a natural preference is a far cry from connubial compatibility.
To our knowledge, nobody has actually surveyed married Hutterite couples to determine whether MHC compatibility plays a role in their levels of marital bliss, or the quality of their dinner conversation, or the frequency of their escapades between the sheets.
On a more global scale, no data have yet established a relationship between MHC compatibility and lower divorce rates. One must ask precisely what we mean by compatibility. At the most fundamental level, couples with MHC-dissimilarity and thus more so-called mating compatibility demonstrate lower rates of spontaneous abortion. The dissimilarity may also increase genetic polymorphism , which in turn may lower the manifestation of recessive diseases.
However, the impact of MHC-dissimilarity on either of these phenomena is likely to prove relatively small, and therefore should not be expected to play a significant role in the marital happiness or cohesion of many couples.
In addition, genetic polymorphism may help species survive environmental challenges—yet evolutionary advantage is probably not a major variable that most couples consider when seeking romantic bliss. One cannot also ignore the unknowns: Matching couples based on MHC markers may pose some survival benefits, but nobody knows at what cost; it is theoretically possible that the offspring of such couples are also more aggressive or less creative, just to name two traits arbitrarily—and magnifying these effects artificially might prove significantly deleterious to our civilization in the long run.
Harvard geneticist George Church has championed another version of compatibility. Using whole genome sequencing, he hopes to match couples so as to reduce or eliminate many recessively inherited diseases. In Ashkenazi populations, the Committee for Prevention of Jewish Genetic Diseases better known as Dor Yeshorim already uses a voluntary testing and matching system to prevent disorders such as Tay-Sachs, Canavan and Niemann-Pick.
Church hopes to implement a variation of this program for couples everywhere, claiming it could end some 7, genetic diseases and save 50 million lives a year. If couples are encouraged to use his pairing system, then those who find love outside the realm of genetic matchmaking and produce offspring with genetic disorders may be unfairly stigmatized.
At a more practical level, even if the elimination of recessive illnesses is a social good, it is clearly not the sort of compatibility most daters seek in a matchmaking service. When most people speak of romantic compatibility, the odds are that they mean factors like temperament, tastes and interests. To date, no study has connected these with any genetic variable. MHC-dissimilarity is as likely to lead to partners with temperamental and aesthetic difference as to those with similarities.
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