How did humans avoid incest in nature?

Question

Is there something in nature that prevents, or deters, us from having s*x with close relatives? How did we avoid inbreeding and all the dangers associated with that?

Answer 1

How did humans avoid incest?  

I am not sure they did.    For a more detailed explanation, read this and gasp:   http://www.psychohistory.com/htm/06a1_in...

*Unfortunately, there are many, many alleged accounts of incestuous relationships, particularly involving children,  in the not-too-distant past of certain countries.  India is one of them; Japan is another.

Answer 2

They learned to stay in families, and not be banging their family.