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I can answer this two ways. I can answer as a Jew, whose first response is to think in terms of Jewish philosophy: incest is wrong for Jews because the Torah tells us that God forbids it. This explanation is, of course, only relevant to Jews.
I can answer as a reasoning thinker. Incest is as wrong as our societies choose it to be. Probably, incest taboos developed to prevent excessive interbreeding; given that we are capable of screening for genetic abnormalities and refusing them to enter the gene pool, it should no longer be a factor. There is no objective (non-faith-based) reason that I am aware of why incestuous sex between two consenting adults ought to be considered immutably Wrong in modern Western society.
That said, I did have cause to say in a different thread-- and will repeat it here-- that I would imagine that incestuous sexual relations strike me as being extremely prone to creating or fostering identity, boundary, and self-other differentiation issues, as well as various tensions relating to jealousy issues. Does this make it intrinsically wrong? Probably not, although it might make it intrinsically unhealthy or unwise. Then again, if we call all unhealthy or unwise relationships "wrong," we'd probably end up indicting most of the relationships in America.
So, I guess, my answer as a reasoning thinker boils down to: it isn't.
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Dull sublunary lovers love,
Whose soul is sense, cannot admit
Absence, because it doth remove
That thing which elemented it.
(From "A Valediction: Forbidding Mourning" by John Donne)
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