The Durex study concluded, "Given the wide range of penis sizes and the relatively narrow range of condoms designed to fit them, it is perhaps unsurprising to find that 50% of respondents felt that the condoms they use did not fit them properly”.
The answers provided also indicate that condoms which don't fit properly are more likely to break during use..."
Another study performed by La Trobe University in Australia examined the effect of penis dimension on the probability of complete condom slippage and/or condom breakage in actual use.
A total over the course of the study, 16% of the men experienced at least one instance of breakage and 19% experienced complete slippage.
The study concluded that condom breakage was strongly associated with penis circumference, particularly for men with above-average girth.
In fact, each additional centimeter of penis circumference beyond the average 13.19 cm increased the risk of breakage by 50-100%.
Like the Durex study, the researchers concluded, "This finding suggests a need to increase either the range of condom sizes currently available or the [girth] of currently available condoms.” of 3,658 condoms were used by 184 men.
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