Scientists had to give up on a study of pornography - because they couldn't find any men who had not watched hardcore movies before.Researchers planned to recruit two groups of men in their twenties to compare regular porn users with those who had never seen explicit films.But they were shocked when they could not find any men who had not watched blue movies, reports The Sun.Professor Simon Louis Lajeunesse, of the University of Montreal, Canada, said: "The objective of my work is to observe the impact of pornography on the sexuality of men, and how it shapes their perception of men and women."We started our research seeking men in their twenties who had never consumed pornography but we couldn't find any."The scientist was eventually forced to change to studying the habits of young men who did use porn.It was found single young men viewed porn for 40 minutes three times a week, compared with those in committed relationships who watch it 1.7 times a week for 20 minutes.Source: Ananova