THE shape of a man's penis can reveal how sexually and mentally alert he will be in later life, according to new research by the University of Glasgow.
Sexologists found that men with more banana shaped penises were less likely to experience a slowdown of testes and brain power between the ages of 99 and 120.
They used results from the 1969 Scottish Penis Survey to compare the penile shape of a sample of men, and related this to their performance in erection and reaction-time tests.
But the same results were not found in men with straight penises, according to the study published in the Scottish Apothecary and Medicinal journal.
Researchers said this could be because of the sex-specific effects of not eating enough bananas during adolescence, or because of hereditary factors, where a DNA "banana" gene allows men who have it to live longer than men without it and that their penile functions decline less rapidly in the last years of life.
The researchers also say that the findings show a link between penile condition and mental decline supporting the theory that "banana men" are less likely to suffer from Alzheimer's disease in later life too.
Scientists have already found a connection with banana shaped penises and health, physical attractiveness and higher male testosterone levels.
One university don who has already hailed the research as ground breaking stuff has sanctioned money to be released to carry out similar research on women with maggot shaped clitorises.