Adultery Versus Concubinage
These are crimes of infidelity. Both crimes are committed when the parties are lawfully married, meaning they have celebrated their marriage under the Philippine laws. Thus, if the parties are not married, regardless of multiple partners the other party may have, or regardless of how infidel the other party may be in the eyes of the other party, the aggrieved party cannot file adultery or concubinage as the case may be.