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Originally Posted by Bill O'Rights
 Now... why doesn't that surprise me? When I first read the OP, I knew that you were gonna come up with something along those lines. |
No idea, because its logical?
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Cervantes pointed out that; "Mentally many of us has a block, a form of mental stop when it comes to mixing even the thoughts of familymembers and sex." Is that biological? Or is that learned behavior?
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Its both, its learned behavior due to instinct. We have an instinct NOT to mate with those we grew up with, its been shown many times (I don't have time to list them), this creates a natural aversion to incest. Also brother/sisters who are raised appart have a greater than normal chance of falling in love. Likewise non-realted children raised together rarely marry or have children together, even when that was the intended outcome. It would be interesting if the father raised her in this case or not (and by raised I mean be a dad, not just be in the same big house somewhere). This instinct is considered weakest between fathers-daughters.