mmmm ... "things that aren't offensive" is in the ear of the beholder. Niggardly is fast disappearing from the language, and I have felt for a long time that the main reason is it no longer in use is that is sounds like the N-word as Aaron McGruder calls it. People don't want to say it.

People used to refer to the "limbs" of a piano because, I suppose, they thought "legs" had the potential to evoke prurient images. People in different eras are offended by different stuff. Mostly the stuff that offends people isn't inherently or universally offensive.

Well, except maybe for really gross stuff that most people would never do anyway, because they KNOW it would cause serious offense.