A post on KillerFrogs called Another possible psych science fair experiment explains how they determined this:

Basic finding is as follows: Here are some pictures of “babes” or “dudes” (depending on your proclivities). You may look at the “face box” or the “body box”. Which do you prefer. When the additional instruction was to think about the pictured person as a future wife/husband as opposed to a one night stand clear differences arose. When considering a wife, for men, the face was the more important thing to examine. When it was a quickie, the body was. The effect only works for men, women always prefer the “face box” regardless of scenario.

“For me, the highest level of sexual excitement is in a monogamous relationship.” Warren Beatty

The Wall Street Journal in a post Can Genes Explain the Sex Divide? by Matt Ridley (you can read the post on his blog RationalOptimist ‘Peculiar human sex differences’ explains in more detail the findings:

Recently, the psychologist David Buss’s team at the University of Texas at Austin reported that men, when looking for one-night stands, check out women’s bodies. Or as they put it, “men, but not women, have a condition-dependent adaptive proclivity to prioritize facial cues in long-term mating contexts, but shift their priorities toward bodily cues in short-term mating contexts.”
Yet we would be a very peculiar animal species if we did not have sex differences in behavior as well as anatomy. In virtually every mammal and nearly all birds, males are more aggressive, females more nurturing. It is a distinction that goes right back to active sperm competing for stationary eggs in the primeval ocean. It was only reinforced when the invention of the placenta and the mammary gland gave male mammals a gigantic prize to compete for: nine months and several years of somebody else’s bodily efforts.  Wombs are worth fighting over—and granting to favored applicants only.  So it’s no zoological accident that in all societies, however peaceful or violent, men are about 50 times more likely to kill other men than women are to kill women, and they do so most in young adulthood, when most actively competing for mates. Likewise, it is no neurophysiological accident that women coo over newborn babies more enthusiastically than men do. Women who showed interest in babies left more genes behind than those who were indifferent; men who turned violent left more genes.
In all hunter-gatherer societies there is a sharp difference between the foraging strategies of the two sexes. Men generally travel far in search of mobile prey that they need to bring down with well-aimed projectiles. Women generally go out in groups and search for good sources of roots, ripe berries or nuts, which they use their acute powers of observation to spot and collect.
Without knowing it, golf-course designers are setting up a sort of idealized abstraction of the hunting ground, while shoe retailers are setting up a sort of ersatz echo of the gathering field.

Now a leading neuroscientist says women’s brain power is no different to men’s after all – and we are actually incredibly similar when it comes to intellect.
Professor Gina Rippon says the idea that our brains are controlled by our gender is outdated and wrong.
And she has even accused researchers of producing findings that can be used to support the old prejudice that women are not men’s intellectual equals.
‘There is increasing concern within the neuroscience community about the misinterpretation and abuse of our findings on the links between brain structure and
behaviour,’ she said.
‘This “neurohype” is designed to support stereotypes and to suggest that there is a major biological and structural difference in the brains of men and women that explains their social roles and status.
‘Throughout history, biological explanations have been used as weapons to explain and maintain social differences,’ she added.
‘In Victorian times, scientists suggested women thought with a different part of their brain from men.
‘In the 1950s they came up with the idea that women’s “inferior” thinking was controlled by their hormones.
According to Delusions of Gender, by Cordelia Fine, the difference between the genders is down to the way we are brought up.
There are no major neurological differences, the Melbourne University psychologist said.

“How can our relationship grow when you don’t respect my need to discuss everything that is wrong with you?” Michael Lipsey

You can find the abstract from the study More than just a pretty face: men’s priority shifts toward bodily attractiveness in short-term versus long-term mating contexts if you would like to read all the scientific facts.
I’d like to leave you with a very funny banned Aussie ad ‘How to Get Rid of a One Night Stand (Funny)’ (I’m sure we inherited our great sense of humor from our Irish origins?)  It’s hysterical, enjoy…

Click here to view the embedded video.

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• Can Genes Explain the Sex Divide? (online.wsj.com)
• Forget Venus and Mars. Men and women DO think alike (dailymail.co.uk)
• Separating Neuroscience from Neurosexism (blogs.howstuffworks.com)
• The gender myth (theage.com.au)
• Women and men have virtually identical brains, scientist claims (telegraph.co.uk)
• A brain strained by sexism (theage.com.au)
• Men And Women’s Brains Are Basically the Same, Men Are From Mars Be Damned (queerty.com)
• Male and female ability differences down to socialisation, not genetics (guardian.co.uk)
• Do men and women really think alike? (telegraph.co.uk)
• One-night stands explained (healthland.time.com)