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Once a condom has sperm in it, be careful!
How to figure out your condom size. Use the following steps to take an accurate measurement of the penis and find the best condom fit: The average erect penis is 5.16 inches long and 4.59 inches wide, according to a review of 15,500 men's penises. This gets you your condom nominal width in millimeters (mm).
To avoid things like condom flips, slips, and leaks, wrap your thumb and index finger. A good rule of thumb is to keep within 5mm above or below. The average condom is 7.5.
To do this, divide your girth measurement by 3.14. Use a toilet paper roll to measure your penis girth. If you take all the condoms widely available on the market and sort them out by their size, you get four distinct.
The resulting number is your width.