Is it possible to urinate and defecate at the same time?

Answer 1

Yes you can defecate while in a well rested standing position. You need to slant your back and bend your knees and push.

Yes. Bend over and touch your knees as you push. Doing this can give you a little leverage if you need to push a little harder to get it started if you are little constipated.

Answer 2

There is a muscle, called the puborectalis, that loops around the very lowest part of your intestine and chokes off your bowel like a lasso. It's because of this muscle that you have continence. The sphincter at your anus is only for short-term emergencies; usually your puborectalis muscle is what keeps you from pooping when you don't want to.

When you're standing up, the puborectalis is pulled tight around your bowel. When you're sitting, it holds the bowel less tightly, and when you're squatting (which is the natural position to poop in), your bowel straightens out fully, allowing feces to travel through easily and pass out of the body.

So normally, no, you can't poop when you're standing up. However, it is possible to have feces sneak past that muscle, and then you would find it difficult to prevent yourself from pooping regardless of your body position. Anyone who has had diahhrea can attest to that.