Condom size got me curious so I wanted to learn more about the significance of "S.52", "S.54" or "S.56". Here's what I found. (DISCLAIMER: If you find all this a bit confusing, as I did, you might just asking a  prospective masseur if he's from Isaan.) Condom size by the base flat width: Small - 50 mm (1.97 inches) +/- or smaller Standard - 52 mm (2.05 inches) +/- Large - 54 mm (2.13 inches) +/- XL - 56 mm (2.21 inches) +/- or larger Frequently Asked