Correct condom fit confirmed by condom industry

On its web site, Kimono condoms company created a pretty nice condom information page. Among other subjects, the condom size issue is nicely treated. This is rare enough in the condom industry to be quoted:

Average Penis Size

Penis Length: Many studies report the average erect penis length is about 6 inches. Anywhere from 5 inches to 7 inches is a common erect penis length.
Penis Girth: Many studies report the average girth of an erect penis is about 4.5 inches. Anywhere from 4 inches to 5 inches is a common girth for an erect penis.

Condom Size & Penis Size
IMPORTANT: to prevent slipping, the condom girth should always be smaller than the penis girth (circumference)
Small condoms – recommended for a penis under 5 inches in length, or under 4 inches in girth (condom girth less than 3.9 inches)
Standard condoms – recommended for a penis between 5-7 inches in length, or 4-5 inches in girth (condom girth 4.0 - 4.39 inches)
Large condoms – recommended for a penis over 7 inches in length, or over 5 inches girth (condom girth 4.40+ inches)

On top of it, they provide an interesting condom size chart whose data where obtained from product purchased in the market place:

Condom Brand Name Condom Size Condom Length (inches) Girth/Circumference estimated (inches) Latex Thickness (mm @ 90 mm point from open end) Kimono MicroThin Standard 7.48 4.10 0.049 Kimono MicroThin Plus Aqua Lube Standard 7.48 4.10 0.049 Kimono MicroThin Large Large 7.68 4.68 (head width) 4.10 (body width) 0.055 Kimono MicroThin Ribbed + Sensi-Dots Standard 7.48 4.10 0.065 Kimono Thin Standard 7.48 4.10 0.055 Trojan Bare Skin Standard 7.26 4.26 0.046 Trojan Ecstasy Standard 8.19 4.38 0.095 Trojan Ultra Thin Standard 7.26 4.22 0.055 Trojan Stimulations Ultra Ribbed Standard 7.31 4.24 0.121 Trojan Magnum Thin Large 7.53 4.44 0.080 Lifestyles THYN Standard 7.30 4.12 0.059 Lifestyles Ultra Sensitive Standard 7.20 4.18 0.074 Lifestyles Ultra Thin Standard 7.38 4.22 0.061 Lifestyles KYNG Large 7.33 4.44 0.075 Durex Extra Sensitive Large 7.98 4.42 0.059 Durex Extra Sensitive Ribbed Standard 7.27 4.10 0.076 Durex Pleasuremax Large 7.76 4.44 0.114 Crown Skinless Standard 7.21 4.14 0.062
All details here: http://www.kimono-condoms.com/condom-size.html A few remarks though: - Concerning the large size condom, also called magnum condoms, Kimono condoms takes a safe 13% ratio between the erect penis circumference and the condom girth (2 times the condom size). This is consistent with the data reported in this blog. - The "legendary" trojan magnum condom is not so mythical after all (no pun intended). This is a large condom among others. Somebody with a 5in erect penis girth can wear a magnum condom (be careful, to prevent slipping, to choose a tight enough condom). - For the standard and small size condoms, always ensure that your erect penis circumference is quite bigger than the condom girth.