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.

We have genes to prevent us from fucking those we are brought up with. A bunch of jews lived in a commune and put girls and boys naked in the same shower etc.. but at the end they didn't want to marry and have kids because they instinctively saw themselves as brother and sister even though they weren't related.

This is a fact.