Civil Code, Art. 739

The following donations shall be void: (1) Those made between persons who were guilty of adultery or concubinage at the time of the donation; (2) Those made between persons found guilty of the same criminal offense, in consideration thereof; (3) Those made to a public officer or his wife, descendants and ascendants, by reason of his office. In the case referred to in No. 1, the action for declaration of nullity may be brought by the spouse of the donor or donee; and the guilt of the donor and donee may be proved by preponderance of evidence in the same action. (n)