I am inconsistently having trouble with the catheter coming off my husband at night. He doesn't move around (he's a stroke victim) so I know it's not from motion. I used the measurement device so I'm pretty sure it's the right size. The brand I'm using is Freedom Clear, latex free (silicone) with adhesive, intermediate 31 mm. I trimmed the pubic hair and I'm washing the area, but I'm still having this problem. I saw that a couple of you are giving these catheters away for just postage, and I don't want to request them if they won't work! Does anyone have any suggestions?? When it does work, it's terrific.