SIZE really does matter and that's official.
Researchers measuring up manhoods in the Viking Age have found opinions have not changed in 1,000 years.
The study, by Dr Carl Phelpstead from Cardiff University, found medieval Icelanders had the same worries about the size of their Jon Thomassen as men today.
The Vikings may be known for being horny little devils but some of them were troubled by the size of their weapons.
The findings are based on an analysis of the legends of the Viking Age - the Sagas. These texts cover events which were supposed to have happened in the 10th and 11th Centuries.
References to the private lives of the warriors in the Sagas of Icelanders found that many of the warriors' fears or inhibitions are the same as those experienced today.
In one story a female servant burst out laughing when she saw one of the warriors naked.
The paper, called Size Matters: Penile Problems in Sagas of Icelanders, was presented to the recent International Medieval Congress in Leeds.
Dr Phelpstead, who teaches English Literature and Cultural Criticism, said: "These narratives reveal a relationship between the male genitals and men's identity that is both familiar and alien to us."
The research concluded that in the Sagas of Icelanders, as today, size does matter and men who don't measure up can be subjected to mockery and humiliation.