University of warwick dating
That's still under investigation, but there is evidence that psyche and sex feed off each other.
Despite last year's controversy the women have remained undeterred and have released images from their 2015 calender containing even more naked images of the rowers claiming it is their best calender yet.
But despite common theory, more money doesn't get you more sex, say "happiness economics" researchers.
After analyzing data on the self-reported levels of sexual activity and happiness of 16,000 people, Dartmouth College economist David Blachflower and Andrew Oswald of the University of Warwick in England report that sex "enters so strongly (and) positively in happiness equations" that they estimate increasing intercourse from once a month to once a week is equivalent to the amount of happiness generated by getting an additional ,000 in income for the average American.
Although January is still a little way off the girls have already received 200 pre-orders from across the globe for their 2015 calendar, including from the Gay and Lesbian Rowing Federation in Boston, USA.
In fact, the economists calculate that a lasting marriage equates to happiness generated by getting an extra 0,000 each year.
"It is just a harmless bit of fun for a fabulous cause and our fan base has only really grown as a result of last year's furore.
"So many people got in touch whose lives had been effected by cancer to say thanks - and who can criticise us for that?
Despite popular opinion, they find that having more money doesn't mean you get more sex; there's no difference between the frequency of sex and income level.
But they do find sex seems to have a greater effect on happiness levels in highly educated -- and presumingly wealthier -- people than on those with lower educational status.
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But their "econometric" calculations confirm what psychologists have long known: People who consider themselves happy are usually richer in sexual activity.