There was a time when medicine put a lot of focus on the smell and consistency of bowel movements. There's probably something to it but we have better diagnostics now. That said, normal bowel movements can have a bit of an odor but it should not be strong or particularly foul-smelling. If it is, consider changing your diet or getting it checked out if that doesn't help. I found that just cutting out fast foods made that particular bodily function nearly odorless.