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It can cause retardation and other birth defects. Sometimes some inbred people may just seem a little off, oddly ugly or slow...But sometimes inbred offspring comes out normal.

As for the effects on the people having the incestuous relationship, I imagine it's probably never good. Just having to question whether or not something youre doing is wrong because it never feels right is a big indication that it's bad.

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13y ago

What else can I help you with?