Is it wrong for a man to have sex with his brother?

[Clinton Huxley]

http://www.scientificamerican.com/artic ... ibling-sex

Yeh, I can see why evolution would evolve a mechanism to avoid this happening.
Although you would think that evolution simply wouldn't evolve gays.

But the species closest to us, Bonobo apes, have sex with just about everybody, almost like shaking hands.
I don't know if they have taboos about sibling sex. If they do, it's the only one that they have.

I'm sure logically, I shouldn't feel that it's particularly wrong. But it does seem wrong. And I imagine that it does to most people.
I'd love to know what the Cardinals would make of it.

those Bonobos...sounds rather like Eton after lights out

[Hermit]

sounds rather like Eton after lights out

More accurately, the topic evokes the sound of brothers in arms.

[JimC]

Threads like this make me glad I'm an only child...

[mistermack]

Threads like this make me glad I'm an only child...

Quite right.
You go for it. There's nothing wrong with it.
Everybody does it !