Well, I normally wouldn’t get involved in something like this, but my curiosity has been piqued. B-Dude, before this discussion goes any further, I think you should clarify your OP. It is not clear to me what your premise is.
Are you saying that committing incest is the same thing as using drugs that are illegal? If so, then I think we should distinguish between types of incest. There is incest between consenting adults, and there is incest in which one party is a child (and please, folks, no legalistic quibbles about what constitutes a “child”. The first time I hear somebody chortle, “Hey, if they’re big enough, they’re old enough…” I am going to trot right back over to Comments.)
Here is the dictionary definition of “incest” according to Webster’s Deluxe Unabridged (second edition, 1979): “Sexual intercourse between persons too closely related to marry legally.” And that’s it. This would seem to include sex between parents and their children, between aunts/uncles and their brother/sister’s children, between grandparents and their grandchildren, and between certain degrees of cousins. It would include stepfathers and stepmothers, half-sisters and brothers, step-sisters and brothers, adopted siblings, and in-laws.
Now, obviously, after 10,000 years of civilization, we have developed a body of law and custom that further defines what we mean by the word “incest”, and I think that we would like to hear you tell us what you mean when you use the word.
The word “incest” covers a lot of territory, as does the word “ethics”. By “ethics”, do you mean “laws”, or do you mean “the right or wrong thing to do”? Do you mean “ethical” or “legal”? Sometimes there’s a difference.
I am not aware, for starters, that sex between consenting adults who happen to be too closely related to marry is technically illegal. It may be unethical, but is it illegal? (I welcome enlightenment on this point.) If the cops catch me in bed with my stepfather (or stepmother), am I liable to be arrested (assuming that we are both of age)? For what?
It’s possible to use verbal shorthand in any discussion, as long as everybody concerned understands what all the secret code words mean.