A Scottish Government survey found that young adults are three times less likely to object to porn than their parents' generation and seven times less than their grandparents'.
In a poll of attitudes, only 6%of 18-29-year-olds said that watching porn was always wrong, compared with 25% among older age groups.
Vivienne Pattison, director of moralist campaign group Mediawatch-UK, said:
This very sad trend comes as no surprise because this is the first generation that has had access to porn at the click of a mouse, 24/7.
In previous eras, it was little more than pictures of naked ladies; whereas today's material is often violent and misogynistic.
The Scottish Government poll interviewed nearly 1,500 adults across all age groups, asking how wrong it was for an adult to watch pornography at home. In all, 21% said it was always wrong. Among the over 65s, however, the figure was 44% and 18% for
those aged 40 to 69. It was 17% for people in their 30s, but only 6% for the youngest age group.
Meanwhile, those on higher incomes and with better qualifications were more accepting of pornography.