sometimes your sister is hot, i'm sorry if your sister is ugly and you can't relate

it isnt

to keep humans all the same species

Yeah I dont think it is, maybe in some states? You cant marry a sibling I suppose, but bang away.

Because of this:

lol thats probably a mask or something

I know this is just a troll post, but I'll post anyway.

It was okay six thousand years ago when the human body was at its prime. Plus, it wasn't like we had a choice when we only had one man and one woman to begin with. Today, however, babies born via incest can have multiple health deficits. Humans are not the only ones with this problem - animals have it, too. Take purebred dogs for instance.

Or go to a cattle ranch and check out their genetics charts lol

Cuz i wanna be the one to fuk your sister