It also showed that men with smaller noses have a penis length of 4.1 inches, when erect.
The study, which was published in Basic and Clinical Andrology, looked at the corpses of 126 men, within three days of death and measured a range of body parts.
Researchers from Kyoto Prefectural University of Medicine took into account their height, weight, the length of their penis when flaccid, the circumference of their penis and the weight of their testicles.
They said that an accurate way to replicate the length of an erect penis is to lay the cadaver out and pull the penis up as far as it would go - this gives them the 'stretched penile length (SPL).