A quarter of young men are worried about the amount of pornography they view on the internet.
According to research, heavy users reported problems in their jobs and their relationships.
Over 1,000 18-24 year olds were asked to take part in the study. Almost eight in ten of the males said they had viewed online porn compared to a third of females.
Damage
Dr Heather Wood of the Portman Clinic told the BBC: “Those people spending large amounts of time accessing porn are not having more fun.
“They are more worried about themselves, more worried about what they are looking at, and report more relationship problems.”
There has been growing concern about the problems caused by pornography, particularly on the young.
Children
In March MPs heard that 40 per cent of 11-16 year olds are aware of their classmates sending sexually explicit pictures of themselves to others despite knowing they are likely to be passed on.
In February a commentator said the pornification of society was having a devastating affect.
Sandra Parsons said the “worst part” of the widespread exposure to porn was that “too many young girls are playing up to it”.
Warped
She said watching porn “can warp the ideas of even the most ‘normal’ of men — ones with loving wives and adored daughters — to the point where he has watched so much extreme porn that he stops viewing women as people and sees them instead only as packages of meat.”
Before the General Election David Cameron pledged to tackle the sexualisation of childhood.
He said: “there’s the creeping sense that we’re sleepwalking to a place where ‘porn is the norm’.”
The Government has set up an independent review to examine commercialisation and sexualisation of childhood.