Unnatural?

We were talking in class the other day about fallacy, and we ended up in a discussion about how people often label things falsely as “unnatural.” What they really mean is that they think it’s “immoral” because anything that is capable of happening is technically considered natural. You remember; it was what led to the talk about toaster sex.

A couple outlandish examples that came out of that discussion included the aforementioned toaster sex and bestiality. Of course, these are things which we would not consider doing—despite that we have established the fact that they are not truly unnatural. There are many other examples of less extreme things that people do even though they are told it is “unnatural,” such having same-sex intercourse or being a nudist.

My question is, Do you believe people should refrain from doing things that are considered “unnatural” by others, either to protect themselves from persecution or protect others from feeling uncomfortable? If so, why?