Modern men are less sensation seeking than they used to be, according to new research.
The St Andrews University study claimed today's men were less willing to take on physically challenging activities.
In the 1970s, men were more likely than women to say they would try things like parachuting or mountaineering, it said.
The report, published in the journal Scientific Reports, said men's thrill-seeking scores were now more in line with the average female.
As part of their work on how being a man or a woman affects social behaviour, researchers Kate Cross and Gillian Brown examined 35 years of studies on sensation seeking.
They said the study supported the idea that some differences between the sexes had narrowed because of cultural changes.
Possible explanations could be a decline in men's average fitness - or that the questions are now out of-date, with activities like skiing no longer being viewed as something out of the ordinary, they added.
The study also showed differences between men and women in other measures had not changed across time.
For example, the analysis found that men consistently reported higher average scores than women for disliking dull or repetitive activities.