Scientists have finally got a grip on our deepest sexual desires - by looking at what people type into Google.
They have examined one billion online sex-related searches from around the world to find out what users click on when no one else is looking.
The findings have been published in a book called A Billion Wicked Thoughts, co-authored by Ogi Ogas and Sai Gaddam. The pair hope it will prove there is no such thing as sexual deviance as almost nothing is seen as out of bounds.
The survey is so vast it is viewed by many experts as the most complete analysis of human sexual desires.
Among the findings are the fact straight men prefer heavier women to thinner ones and find feet erotic.
They also enjoy a wide variety of erotic images, including bizarrely both elderly women and transsexuals.
Meanwhile straight women enjoy reading about and watching romances between two men, but only when the focus is on emotion and not sex.
Gay men and straight men were found to have the same favourite body parts, which in order are chests, buttocks then feet.
Surprisingly, search engine results from Dogpile, which provided the search data from Google, Yahoo! and Bing, said almost 80 per cent of internet searches were made up of 20 interests, ranging from youth, to cheerleaders.
Mr Ogas told the New York Post: 'Sex therapists haven't known which interests are common and which are rare,'
'We probably now know more than ever before.'
Doctors said the findings may now help reassure patients who think what they are interested in is perverse or disturbed, when it may actually be quite common.
Information from the search also found men fantasise about group sex more than women, and picture more men than women in the action.
Straight men prefer to watch amateur porn online and domination and submission is popular among straight women and gay men. Gay men also enjoy watching straight porn.
Experts think because porn is so readily available on the internet it may be helping human desire evolve as billions of men and women log-on more and more.
Prior to the internet boom there were less than 90 porn magazines but now an estimated 2.5million porn sites have been blocked.
However, Donald Symons, a pre-eminent evolutionary psychologist in America, thinks the survey does not necessarily prove people find the images arousing and they may just be searching out of curiosity.
Others point out that there is no way of knowing what motivated any of the searches.
Dr Symons told the New York Post: 'Ogi is convinced that when people are searching for things, it's primarily for sexual arousal. I'm not so sure about that. If there was a porn star with three breasts - I bet there would be a zillion hits. Would that be a sign men were suddenly aroused by that? I think not.'
The book's authors however, argue that the study does prove a sexual desire as they noticed people were spending money on subscriptions and visiting the sites over and over again, proving they are not just curious.