Should the government have a say in what two or more consenting adults do in their own home?
Unless you are harming or killing animals or humans, it's okay by me to do your crazy stuff behind the doors of your home.
Unless they are committing acts with a non-consenting person.
Generally no, but no amount of mutual consent would allow murder within the home boundaries.
If it's incest then yes.
I'm going to say no, even in that case.
Being gross and creepy shouldn't be illegal.
It's just gross and creepy.
1. Inbred children
2.Incest has a lot of negative effects
Which are gross and creepy.
The only persons harmed, other than those doing it (though that's arguable) are their potential children, which may or may not even be an issue.
What if one of them is infertile, as an example?
As much as I would prefer they not breed. I don't think who can and can't breed should be legislated.
But what about 2 consenting adults raping a child?
That involves a third entity, which, by definition, cannot consent.
That's also illegal, for the reason stated above.
That's a somewhat ridiculous question, in that it describes a completely different situation.
The question only referred to two individuals, alone.
Correction, it says "two or more consenting adults."
It does allow for multiple entities, but all entities specified in the question are adults, capable of consent.