Oh geez.

The biggest reason why people view it as wrong i think, though they may not realize it, comes down to the idea that the child may have health issues or deformities. But the risk is a lot lower than we originally thought especially if say two siblings are only half siblings, or even for cousins. The risk is higher the more dna you share. I really just don't give a fuck what other people do in the bedroom. The idea of fucking my dad or mom is just fucking disgusting, and since i don't like it i won't do it. But by all means, what ever gets your rocks off.