Retailer Condomania began marketing TheyFit condoms, the only custom-sized prophylactics that come in a wad-blowing 55 different sizes. How does one know what size he is? By measuring length and width with the "Fit Kit," a ruler that, incidentally, does not show inches, but nonsequential letter and number codes like S77 or B17, which is also how TheyFit condoms are sold.