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from www.dailymail.co.uk – Americans are most likely to search online for pornography in winter or early summer, according to a new study that claims sex and mating behaviors are seasonal.

Researchers at Villanova University in Pennsylvania plugged ‘porn’, ‘xxx’ and x-rated’ into Google Trends as well as a range of more specific naughty words and phrases.

Interestingly, they found keyword searches over the past five years relating to dirty images and movies had clear peaks and troughs, recurring at six-month cycles.

The same was found for internet searches relating to prostitution, according to The Atlantic.

However, it is not just shady or illicit activities that receive a boost at certain seasons – mainstream dating websites experience the same spike in search traffic as pornographic sites.

But there was no such pattern for non-sexual words, which were tested as a control group.

The results, published in the Archives of Sexual Behaviour, fit with previous studies showing seasonal trends of births, sexually transmitted infections, condom sales and abortions.

It is unclear why people appear to become more sexually active in the midwinter and early summer.

One theory is that it is because these times coincide with the main holiday season in most western countries, when people’s minds turn to leisure activities rather than work.

However, it may instead be linked to a more biological explanation, with certain seasons being a time when we are pre-programmed to seek to reproduce.

The Villanova research, which was led by Dr Patrick Markey, also showed another interesting quirk in the pattern of searching for online smut.

The number of people Googling porn appears to have crashed in late 2009, before soaring again in early 2010.

If the data are accurate, they may be linked to the financial crisis, which caused a recession in 2009, disrupting nearly every indicator of economic activity.