Difference between male and female catheter- The main difference between male catheter and female catheter is size of catheter. Male catheters are usually longer than female catheter because a man's urethra is significantly longer than a woman's. Male catheter size 14F is commonly used by both men. A Woman use catheters with a size of 12F. Sometimes Some women, especially those who are larger or less movable, prefer to use a male length catheter because they can more easily access the catheter's outer funnel end.