Because the lowest part of the colon - the sigmoid - is on the left side of the body. Hence, when the effect of the enema takes place, the large intestine is primarily working "downhill" - which is best from several different medical standpoints.
so that enema solution can flow by gravity in the natural direction of the colon
Just a guess--does it have anything to do with the best access for a right-handed person who is performing the procedure?
Left.
You are supposed to put it on from the horses left side.
The left side
It is polite to put it on the left side. (Your drink goes on the right, and if you're at a restaurant then your bread goes on the left.)
Yes, you can put it on your butt abdomen or your upper outer arm
Inside or left side.
you put the candles in from right to left and you light them from left to right.
right side
to put headphones on your ears is to put the left side of headphones is put headphones away from your ears
It is polite to put it on the left side. (Your drink goes on the right, and if you're at a restaurant then your bread goes on the left.)
with your left foot, you can try it on the right side, but that is not as easy
You insert them on the top-left hand side of the iPad.