Carnal intercourse with relatives, of blood or affinity, whom the Church forbids one to marry. The circumstance of relationship adds a special malice to the sin of impurity because, by committing this sin with a relative, one sins also against the virtue of piety which prescribes due reverence towards those who are closely related.
This dictionary contains not only definitions and explanations of every subject in Religion, Scripture, tradition, doctrine, morals, sacraments, rites, customs, devotions and symbolism, but also accounts of the Church in every continent, country, diocese; missions, notable Catholic centers, cities, and places with religious names; religious orders, church societies, sects and false religions. It has brief articles also on historical events and personages, on the Old Testament and New, and on popes, prelates, priests, men and women of distinction, showing what the Church has done for civilization and correcting many errors which have hitherto passed for history.Wikipedia
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