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Finding your perfect match really is about the right chemistry, but it’s a complex equation, says the American scientist Martie G Haselton
From The Sunday TimesMay 28, 2006
Selecting a mate is the most crucial decision of our lives. We spend a huge amount of time and energy trying to find that special someone. Our appetite for a relationship fuels a billion-pound industry of matchmaking services. Yet we’re often not satisfied. A 2005 survey of more than 900 people who had been using online dating services revealed that three-quarters had not found what they were looking for. We seem as much in the dark as ever about who is a suitable match.
As a scientist studying human behaviour, I am not too surprised by the mysterious nature of how we go about choosing a partner. Mate selection is a highly complex process. We are consciously aware of only part of it; the rest is either inherently unpredictable or operates outside our awareness, which leads us to the perception that love is about ineffable chemistry.
Let’s start with the conscious part. There are some things we all find attractive. Men tend to desire women with features that suggest youth and fertility, including a low waist-to-hip ratio, full lips and soft facial features. Recent studies confirm that women have strong preferences for virile male beauty — taut bodies, broad shoulders, clear skin and defined, masculine facial features, all of which may indicate sexual potency and good genes. We also know that women are attracted to men who look as if they have wealth or the ability to acquire it, and that men and women strongly value intelligence in a mate. Preferences for these qualities — beauty, brains and resources — are universal. The George Clooneys and Angelina Jolies of the world are sex symbols for predictable biological reasons.
Of course, we don’t fall in love with super-mates like these. The average person who did would be headed nowhere, because super-mates are inaccessible to all but a few. This is likely to be part of the reason why love evolved: to bond us for co-operative child-rearing, but also to assist us in choosing, so that we don’t waste time and energy falling for someone who is unattainable. Instead, people tend to fall for others who, on attractiveness, intelligence and status, are of a similar ranking to themselves.
So much for outward appearances. What about the less obvious cues of attraction? Fascinating work on genetics and mate preferences has shown that each of us will be attracted to people who possess a particular set of genes, known as the major histocompatibility complex (MHC), which plays a critical role in the ability to fight pathogens. Mates with dissimilar MHC genes produce healthier offspring with broad immune systems. And the evidence shows that we are inclined to choose people who suit us in this way: couples tend to be less similar in their MHC than if they had been paired randomly.
How do people who differ in their MHC find each other? This isn’t fully understood, but we know that smell is an important cue. People appear to literally sniff out their mates. In studies, people tend to rate the scent of T-shirts worn by others with dissimilar MHC as most attractive. This is what sexual “chemistry” is all about.
The message here is: trust your instincts — except that there is an alarming exception. For women taking hormone contraceptives, the reverse is true: they prefer men whose MHC genes are similar to their own. Thus, women on the pill risk choosing a mate who is not genetically suitable (best to smell him first and go on the pill afterwards). This is a prime example of how chemical attraction can depend on your circumstances.
Here’s another example: attraction can fluctuate over the menstrual cycle. Men evaluate women’s scents as more attractive when they are near ovulation, and in our studies at UCLA, we have found that men are more loving towards their partners as ovulation approaches. Women’s preferences for certain male scents and other male features change over their cycle. Near ovulation, they prefer masculine traits; at other phases of their cycle they prefer less sexiness and more stability. All this suggests that the path to love can be somewhat random, particularly for women.
Having sex can also complicate the way you perceive a potential partner. After sex, the brain releases oxytocin, which results in the warm, companionable feeling of love and the creation of the social bonds that facilitate co-operative child-rearing. Watch out: sex on a whim can lead to feelings of love for a person who is entirely wrong for you.
Sex, of course, is not love. For scientists, love is a conundrum: strictly speaking, sexual desire takes care of reproduction, so what could be the purpose of love, especially since it makes us believe we have found our one true soul mate in a world filled with billions of alternatives? How would our ancestors have been served by such behaviour? One possibility is that feelings of love act as a “stop rule” that terminates the search for a mate, even if only temporarily, so we commit to one person and get on with the business of mating.
But that still poses the question, if the roads to love are so varied and random, how do we decide on a particular mate? It turns out that the problem of choice under uncertainty can be described and solved mathematically. Evolutionary psychologists Peter Todd at Indiana University and Geoffrey Miller at the University of New Mexico used a computer simulation to determine how a person might best choose from a number of potential partners. They set it up so that the person first assesses a number of the options available to them to decide what is the best they can aspire to in terms of attractiveness. They then go for the next person they come across who meets their aspirations, out of those they haven’t already encountered.
The researchers found that the optimum proportion of possible mates to “examine” before setting your aspirations and making your choice is a mere 9% — so at a party with 100 possible mates, it’s best to study only the first nine you randomly encounter before you choose. Examining fewer means you won’t have enough information to make a good choice, examining more makes it likely you’ll pass the best mate by. No doubt the models underestimate the complexity of real mate choice, but the fundamental insight is clear: don’t search indefinitely before choosing, lest you miss out on all the good mates or run out of time altogether.
Who we fall for is determined by a mix of factors, some of which we are aware of, some of which we experience indirectly. Happenstance can play a significant role, especially if we meet someone just after calibrating our aspirations, or at a particular stage of the hormonal cycle. There may be that special someone out there — but they’re not necessarily the only one.
This article first appeared in New Scientist
WHEN THE CHEMISTRY IS WRONG
Guy Taylor is a 32-year-old graphic designer who lives in south London
“I met this girl, let’s call her Becca, in a random bar in Clapham one Wednesday evening. I was with a group of mates and we just got talking. I was a bit tipsy, but I definitely fancied her — she was just my type — so I suggested we hook up. When she left, I gave her a gentle peck on the cheek.
The following Sunday, we met up for lunch at Inn the Park in St James’s Park. I was excited, as I felt the date had potential. The banter was good, and everything was cool, but at the back of my mind, I was thinking, “hang on a minute”. Something wasn’t quite right — we were less flirty with each other than when we first met.
Nevertheless, Becca and I spent the next few hours wandering around town chasing after the wooden Sultan’s Elephant. It was a laugh, and we were happy to spend time in each other’s company. We both had stuff to do, but neither of us wanted the date to end, so there must have been some sort of connection. We went to the cinema to see V for Vendetta. Everything was going well, with hand-holding and snuggling-up together. When we left, we had a kiss. That was the killer. It wasn’t a passionate full-on snog, more going through the motions.
There was something missing — that special feeling I should have felt just wasn’t there. We fancied each other, but the spark was missing — I guess the chemistry was wrong. You can’t fake that.
Being a gentleman, I thought it would be a little harsh to just blow her out — I mean, in theory it should have worked — so I left a voicemail asking her to see me the following Wednesday. She sent me a text back, saying: ‘For me, there was no spark.’ I thought: ‘You see? It wasn’t just me.’ ”
Reproduced by kind permission of www.newscientist.com
Copyright 2009 Times Newspapers Ltd.
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"Spoon plant"
