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If there's one thing guaranteed to get a man feeling awkward, it's the size of his penis. Nobody likes to think they're inadequate or abnormal in any way, especially when it comes to their family jewels! Luckily for every slightly insecure male out there, a study has been conducted that should make a lot of people feel better about their manhood.

The research, conducted by members of the Institute of Psychiatry, Psychology and Neuroscience (IoPPN) at King's College London, collated data from 17 studies that recorded the penis size of up to 15,521 men. This enabled them to create graphs plotting the average penis size, which they hope to use to examine a number of issues.

For example, they will be using the data to study Body Dysmorphic Disorder (BDD), a condition characterised by insecurity and anxiety the size and shape of the body. Sufferers typically see themselves as fatter, thinner or uglier than they are, and this can be applied to penis size as well.

Dr David Veale, leader of the research, said: "We believe these graphs will help doctors reassure the large majority of men that the size of their penis is in the normal range. We will also use the graphs to examine the discrepancy between what a man believes to be their position on the graph and their actual position, or what they think they should be.”

So, how big should your penis be? According to the research - published in the British Journal of Urology International - you should expect your penis to be around 9.16cm (3.61 inches) long when flaccid. When erect, the average size is 13.12cm (5.16 inches). Oddly enough, the average size of a flaccid, stretched penis is slightly larger: 13.24cm (5.21 inches).

The average flaccid circumference was 9.31 cm, and the average erect circumference was 11.66 cm. So what determines penis size? Well, not a lot. The researchers found a slight correlation between height and erect penis length, but beyond that it's fairly random. Hopefully, this information will make plenty of men feel better about themselves!

Sources: King's College LondonBritish Journal of Urology