Apparently, the world is awash with people who can't pinch a good loaf. It seems there's a cork stuck in the asses of a lot of people out there which has made laxatives almost as commonplace as aspirin on drug store shelves.
We even have studies on the matter which claim, "Many people underestimated how often they strained. Overall, 32% of defecations in women and 22% of defecations in men were associated with straining to start and 15% and 9%, respectively, with straining to finish."
And analysis such as this: "Straining was to some extent related to stool type: the lumpier a stool, the more often it elicited straining. However, it seems likely that straining in some people is just a habit."