The external anal sphincter is located approximately 1 cm from the opening of your anus. You can flex and relax this muscle on your own, just as you can flex.
I don’t mean the metaphorical part of my psyche that’s a jerk, I mean my literal, physical, anatomical butt. The anal sphincters get clenched most often unconsciously because they are hidden from view. The anal muscles are like the master valve for sensation in your body.
Exercises to strengthen and tighten your anal sphincter may help treat bowel incontinence (fecal incontinence) or reduce your chance of.
Put a finger or two on the skin between your legs behind your balls, but before your anus. Now imagine you're trying to stop yourself from peeing. Flex that.