Is this really necessary? New to iTunes Store: Penis-measuring app to help you find the best fitting condom and potentially tell your online friends what your size is The developers of the â€˜Condom Sizeâ€™ app, VSM Enterprises, say its purpose is to help men size themselves for the best fitting condom. Users must be 17 or older to download the app, according to iTunes. â€˜This app educates the male population on the proper condom placement and helps determine proper condom size,â€™ the appâ€™s description reads. Condom failure is often due to poorly fitting rubbers, some sexual health experts say. â€™Hold hard member straight against inches or cm on sides of screen,â€™ the appâ€™s instructions for measuring length read. The instructions for measuring girth require the use of a string or soft measuring tape. The app also recommends its users nearby stores to find a condom that fits while providing fun facts and tips on proper condom use. For those curious to know how they potentially measure up, the average penis size is 5.1 inches in the U.S. and 5.5 inches in the U.k., according to one recent study from researcher Dr Richard Lynn, emeritus professor of psychology at Ulster University in Northern Ireland.