Condom size survey. Get information on prevention, symptoms, and treatment to better ensure a long and healthy life. Manufacturers base condom sizes on both length and width measurements. Accurate method for determining functional penile length in Turkish young men. External link. A penis with a girth of 5. However, polyurethane is less flexible than latex, which makes them slightly more fragile than latex condoms. Crown Skinless Skin. Will the development improve the appeal of condoms, the only birth-control method that protects against most sexually transmitted diseases? Copyright notice. Related coverage. The first step to finding the best condom size is to measure the penis. She and her colleagues published a study of 1, men living throughout the United States that found that 83 percent had penile lengths shorter than standard condoms.