Originally Posted by onewayward
It is NOT INCEST.
Incest is defined differently by different cultures.
For example, cousins. Many (non-European) cultures have a belief that your best marriage mate would be one of your "cross cousins," your father's sisters' children or your mother's brothers' children. Yet these same cultures have a strong incest taboo against relations with your "parallel cousins," your father's brothers' children or your mother's sisters' children.
Western European cultures do not distinguish between these two types of cousins: they are both your first cousins. Any first cousins, at one time, were ideal marriage mates; but now it's icky /taboo/ incestuous/ illegal to marry your first cousin.