Just want to note that there are different sizes of condoms. If you don't have enough girth for the standard condom, it can slip off, which is obviously bad. If you have too much girth, it will be pretty uncomfortable, because the elastic ring near the bottom will cut into the penis. Just try the normal condom sizes, and if they don't fit, get ones that do. Carry them with you, because it's your responsibility to be safe. If your partner can't provide different sizes, that's not their problem.