Does making myself defecate reduce the smell of flatulence?

Yes. Having a rectum full of stool just sitting at the anal opening adds to the smell of gas. It is not healthy to keep a rectum full of stool. It is an old wives tale that taking laxaties casues a lazy bowel. It is most healthy to move the bowels once a day with a soft, easy to pass bm. If it takes a "kick in the butt" or a "laxative" , then so be it.