Incest

Someone on /b/ keeps claiming that we have genes that prevent us from being attacted to our siblings. How true is this? I for example find my sister extremely hot. I masturbate to her pictures all the time and would fuck her without a though given the chance.

probabilities of having any trouble between cousins is almost exactly the same as with a stranger of the same race and country?
Uh, no. The more related two people are, the higher the chances are of defective genes expressing themselves in their children. In fact, it lowers their chances of survival enough that a mechanism evolved to avoid inbreeding.