How the hell do you put these things on? I tried a big one at first, it fit perfectly until I went in and it got all loose at the end. I was really embaressed. So I tried a normal sized condom and the same thing happened. Apparently there's just too much slide with the skin. Magnum XL won't ever come off, and I've even broken a few Magnums, but I just was wondering if there's a way to make these things hang on at the end.