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.

>>37
Fail. Chances are higher, but marginally higher, and they are virtually the same. It's brother-sister what's more dangerous, and still, not nearly as dangerous as the church made you believe.

This mechanism to avoid inbreeding is mostly religious taboo, which can hardly be called a product of natural evolution (more like "human stupidity took to the extreme").