Quick answer

Yes—but generally not against the mistress alone.

If a married husband keeps a mistress in the conjugal home, has sexual intercourse with her under scandalous circumstances, or cohabits with her elsewhere, his wife may file a criminal complaint for concubinage against both the husband and the alleged concubine. If both are alive, the offended wife must include both in the complaint. She cannot selectively prosecute only the other woman.

An affair by itself does not automatically prove concubinage. The prosecution must establish one of the specific situations in Article 334 of the Revised Penal Code and the woman’s knowing participation. Private messages, photographs, or an admission of a romantic relationship may be relevant, but they do not necessarily prove cohabitation or sexual intercourse under scandalous circumstances.

The rules are different when the unfaithful spouse is a married woman. Her husband may file adultery charges against her and the man who knowingly had sexual intercourse with her. A wife cannot use adultery to charge her husband’s mistress.

Concubinage and adultery are different crimes

Philippine law still treats the two offenses differently.

Situation	Possible charge	Who may file	Persons who must generally be charged
A married husband maintains a qualifying relationship with another woman	Concubinage	The offended wife	The husband and the concubine, if both are alive
A married woman has sexual intercourse with a man who knows that she is married	Adultery	The offended husband	The wife and her paramour, if both are alive

The legal label “mistress” is not enough. Criminal liability depends on the statutory elements and admissible evidence.

When the mistress may be charged with concubinage

Article 334 of the Revised Penal Code recognizes three ways in which a husband may commit concubinage:

He keeps a mistress in the conjugal dwelling;
He has sexual intercourse, under scandalous circumstances, with a woman who is not his wife; or
He cohabits with that woman in another place.

Only one of these modes must be proved, but each has requirements beyond merely showing that the husband had an affair.

Keeping a mistress in the conjugal dwelling

This applies when the other woman is maintained as a mistress in the spouses’ conjugal home. A brief visit, isolated encounter, or presence in the house does not necessarily establish that she was “kept” there as a mistress. The living arrangement, duration, behavior of the parties, and surrounding circumstances matter.

Sexual intercourse under scandalous circumstances

Sexual intercourse alone is insufficient under this mode. The circumstances must also be scandalous. Whether conduct is scandalous is fact-dependent and is assessed from the evidence and its effect on the community—not simply from the offended spouse’s understandable distress.

Cohabiting elsewhere

Cohabitation means living together in a relationship resembling that of husband and wife for some period. Occasional meetings, overnight stays, vacations, or evidence of dating may support an investigation, but they do not automatically prove cohabitation.

The Supreme Court has explained that cohabitation is distinct from occasional or transient encounters and is ultimately a question of fact. See Ocampo v. People.

Must the mistress know that the man is married?

A concubinage case ordinarily requires evidence that the alleged concubine knowingly participated in the prohibited relationship. A woman who was genuinely unaware of the marriage may raise lack of criminal intent or knowledge, depending on the facts.

Useful evidence may include messages referring to the wife or marriage, public posts identifying the man as married, prior communications between the wife and the alleged mistress, introductions to relatives, or documents showing that the woman knew the couple’s status. Knowledge should not be assumed merely because the affair occurred.

Can you file only against the mistress?

Generally, no.

Article 344 of the Revised Penal Code and Section 5, Rule 110 of the Rules of Criminal Procedure provide that adultery and concubinage may be prosecuted only upon a complaint filed by the offended spouse. If both alleged offenders are alive, the complaint must include both of them.

This means an offended wife ordinarily cannot:

Charge the alleged concubine while deliberately excluding her husband;
Ask a relative, friend, or child to file the concubinage complaint for her; or
Continue with the charge if she consented to the relationship or legally effective consent or pardon bars prosecution.

If one alleged offender has died, the requirement to include both does not apply in the same way. Other unusual circumstances—such as questions about the validity of the marriage, the complainant’s legal capacity, or whether an earlier act amounted to consent or pardon—require individual legal advice.

The governing provisions appear in the Revised Penal Code, Articles 333, 334 and 344 and the Rules of Criminal Procedure.

What the prosecution must prove

A criminal conviction requires proof beyond reasonable doubt. For concubinage, the prosecution will generally need competent evidence showing:

A valid and subsisting marriage between the complainant and the accused husband;
One of the three prohibited situations under Article 334;
The identity and participation of the alleged concubine; and
Circumstances establishing the required knowledge and criminal intent.

The marriage remains relevant even when the spouses are already separated in fact. Moving out, signing a private separation agreement, or living apart does not by itself dissolve a marriage.

Evidence of affection or an extramarital relationship is not automatically evidence of every statutory element. In criminal cases, courts must distinguish suspicion—even strong suspicion—from proof beyond reasonable doubt. The Supreme Court’s treatment of the evidentiary requirements in an adultery prosecution illustrates this distinction: Valencia v. People.

Penalties

Under the current text of the Revised Penal Code:

A husband convicted of concubinage is punished by prisión correccional in its minimum and medium periods, corresponding to imprisonment from six months and one day to four years and two months, subject to the court’s application of the rules on penalties.
The concubine is punished by destierro. Destierro is not ordinary imprisonment; it prohibits the person from entering specified places or coming within the distance fixed by the court.
A wife and her paramour convicted of adultery are each punished by prisión correccional in its medium and maximum periods, from two years, four months and one day to six years, subject to applicable modifying circumstances and sentencing rules.

For adultery, unjustified abandonment of the wife by the offended husband may result in the penalty next lower in degree. It does not automatically erase the offense.

Actual sentencing depends on matters such as mitigating or aggravating circumstances, the Indeterminate Sentence Law where applicable, and the precise allegations proved.

How to file a concubinage complaint

Because the prescribed penalty calls for preliminary investigation, the usual first step is a complaint before the prosecution office with territorial authority over the place where the offense—or an essential element of it—occurred.

A practical sequence is:

Confirm the marriage record. Obtain a current PSA marriage certificate and gather any relevant court judgment concerning annulment, nullity, recognition of a foreign divorce, or legal separation.
Identify the legally relevant conduct. Specify whether the allegation concerns keeping a mistress in the conjugal dwelling, scandalous sexual intercourse, or cohabitation elsewhere.
Establish the place and approximate dates. Criminal venue is generally tied to where the offense or an essential ingredient occurred. Filing in the wrong locality can create a serious jurisdictional problem.
Prepare a detailed complaint-affidavit. State facts personally known to you in chronological order. Separate what you directly saw or received from what another person merely told you.
Attach supporting evidence and witness affidavits. Under Rule 112, the complaint is supported by affidavits and documents sufficient to establish probable cause. Local prosecution offices may prescribe filing formats, copy requirements, or electronic submission procedures, so confirm the current requirements directly with the proper office.
Attend the preliminary investigation. The respondents will ordinarily be given an opportunity to submit counter-affidavits. The prosecutor will decide whether sufficient grounds exist to file an information in court.
Observe deadlines for available remedies. If the prosecutor dismisses the complaint, or finds probable cause, the proper remedy and filing period depend on the resolution, the issuing office, and applicable Department of Justice rules. Obtain the full resolution and consult counsel immediately rather than relying on an informal explanation.

A police blotter may document an incident, but it is not a substitute for the offended spouse’s concubinage complaint.

Evidence worth preserving

Preserve evidence in its original form whenever possible:

PSA marriage certificate;
Lease contracts, property records, utility bills, delivery records, or correspondence linking both respondents to a residence;
Original messages, emails, photographs, videos, or public posts;
Complete conversation threads rather than cropped excerpts;
URLs, account names, dates, timestamps, and download information;
Receipts, travel records, or other documents relevant to cohabitation;
Names and contact details of witnesses with personal knowledge;
Admissions made voluntarily by either respondent;
Prior demands, replies, or notices showing knowledge of the marriage; and
Records of threats, harassment, abandonment, financial deprivation, or psychological treatment if another remedy may apply.

Back up electronic material without altering it. Keep the original device when feasible. Do not add captions, edit screenshots, or impersonate another person to obtain admissions.

Evidence should also be obtained lawfully. Secretly recording a private conversation can violate the Anti-Wiretapping Act, even when the recorder is one of the participants. Do not break into accounts, install spyware, guess passwords, take a phone by force, or publish intimate material. These actions may expose the person gathering evidence to separate criminal or civil liability.

Common mistakes

Treating proof of an affair as automatic proof of concubinage

A romantic relationship, pregnancy, child, hotel receipt, or affectionate photograph may be relevant, but the prosecution must still prove a statutory mode of concubinage and connect both respondents to it.

Filing against only the other woman

When both alleged offenders are alive, excluding the husband is ordinarily fatal to a concubinage prosecution.

Using illegally obtained recordings or account data

The desire to prove an affair does not authorize wiretapping, unauthorized account access, stalking, threats, or distribution of private images.

Posting accusations online

Publicly naming or shaming the alleged mistress can create exposure to cyberlibel, privacy claims, harassment complaints, or other proceedings. Preserve evidence for counsel and the authorities instead of conducting the case on social media.

Assuming separation ends the marriage

Separation in fact and private agreements do not dissolve a Philippine marriage. Conversely, if a court has already declared the marriage void or a foreign divorce has been judicially recognized, the dates and legal effect of that judgment may materially change the analysis.

Delaying because the relationship is continuing

Under Articles 90 and 91 of the Revised Penal Code, crimes punishable by correctional penalties generally prescribe in ten years, with computation ordinarily beginning upon discovery and subject to interruption rules. Determining the starting date can be complicated, particularly when separate acts or continuing conduct are alleged. Do not treat ten years as a safe waiting period.

Consent and pardon

The offended spouse cannot prosecute adultery or concubinage if the legal requirements of consent or pardon under Article 344 are present.

These defenses are fact-sensitive. Consent generally concerns permission given before or during the relationship, while pardon concerns forgiveness after the offense. Courts may examine conduct as well as words. Reconciliation, prolonged acquiescence, written agreements, or resuming marital life may become relevant, but none should be evaluated in isolation.

A pardon intended to bar prosecution must generally extend to both alleged offenders and occur before criminal proceedings are instituted. Do not sign a settlement, affidavit of desistance, waiver, or reconciliation document without understanding its possible effect.

Other remedies may be more appropriate

Violence Against Women and Their Children Act

Marital infidelity may form part of psychological violence under Section 5(i) of Republic Act No. 9262 when the required elements—including the prohibited conduct and resulting mental or emotional anguish—are proved. Infidelity does not eliminate the need for evidence of the statutory offense.

The Supreme Court has held that marital infidelity can constitute psychological violence under the circumstances proved in a particular case. See XXX v. People, G.R. No. 252739. The governing statute is the Anti-Violence Against Women and Their Children Act.

RA 9262 is not a shortcut for charging a mistress simply because she participated in an affair. Liability of a third person would require a legally sustainable theory—such as direct participation or conspiracy—and evidence of the elements attributable to that person. This should be assessed by a lawyer or prosecutor from the actual acts alleged.

If there are threats, stalking, physical violence, deprivation of support, removal of children, or immediate danger, ask about a barangay, temporary, or permanent protection order without waiting for a concubinage case.

Legal separation

Sexual infidelity may support a petition for legal separation under the Family Code even when the evidence does not fit the narrower criminal definition of concubinage. A legal-separation action generally must be filed within five years from the occurrence of the cause, and statutory defenses such as consent, condonation, connivance, or mutual guilt may apply.

Legal separation permits the spouses to live separately and affects property relations, but it does not dissolve the marriage or permit remarriage. See Family Code, Articles 55–67.

Infidelity by itself is not a statutory ground for declaring a marriage void. Nullity and annulment have different legal grounds.

Civil damages

Article 345 of the Revised Penal Code allows the adulterer or concubine, as applicable, to be sentenced to indemnify the offended spouse for damages caused. Other civil claims are highly fact-dependent and should not be assumed merely from proof of an affair.

When legal help is urgent

Consult a Philippine criminal or family-law practitioner promptly when:

The alleged relationship began years ago;
The relevant acts happened in several cities or abroad;
One respondent has died, disappeared, or left the Philippines;
The marriage was celebrated abroad or has been questioned in court;
A foreign divorce or nullity judgment exists;
You previously signed a waiver, settlement, or affidavit of desistance;
You and your spouse reconciled after discovering the affair;
You are considering recording conversations or accessing private accounts;
There are threats, violence, stalking, weapons, or danger to a child;
Money or property is being transferred to hide marital assets;
A prosecutor has already issued a resolution; or
You have received a subpoena, countercharge, or demand letter.

For immediate danger, contact the Philippine National Police or the nearest Women and Children Protection Desk and seek advice about protection orders.

Frequently asked questions

Can I sue the mistress without suing my husband?

For concubinage, generally no. If both are alive, Article 344 requires the offended wife to include both alleged guilty parties.

Is one sexual encounter enough for concubinage?

Not by itself. Unlike adultery, concubinage requires one of Article 334’s three specific situations. If the accusation relies on sexual intercourse, it must have occurred under scandalous circumstances.

Is living together enough?

Cohabitation resembling life as husband and wife may satisfy one statutory mode, but the prosecution must prove it with admissible evidence and establish the alleged concubine’s knowing participation.

What if the mistress is also married?

The offended wife may still include her in a concubinage complaint with the husband if the elements are present. Separately, only that woman’s own offended husband may initiate an adultery prosecution against her and her paramour, subject to Article 344.

What if the mistress says she did not know he was married?

That may be a material defense. The prosecution should have evidence showing knowledge, not merely assume it.

Can screenshots prove the case?

They may help, particularly when properly authenticated and preserved, but screenshots alone may not prove cohabitation, sexual intercourse, scandalous circumstances, or knowledge. Their completeness, source, authenticity, and lawful acquisition can be challenged.

Does a child from the relationship automatically prove concubinage?

No. It may be relevant circumstantial evidence, but it does not automatically establish every element or a particular statutory mode.

Can I file after we separate?

Physical separation does not automatically bar a complaint because the marriage remains in force. However, the circumstances of the separation may affect consent, pardon, evidence, penalties, prescription, or other defenses.

Will an affidavit of desistance automatically dismiss the case?

Not necessarily once a criminal action is underway, but it can seriously affect the evidence and may be examined as proof of pardon, reconciliation, or lack of interest in prosecution. Obtain independent advice before signing one.

Will concubinage end the marriage?

No. A criminal conviction does not itself dissolve the marriage. Legal separation, annulment, declaration of nullity, and recognition of a foreign divorce are separate proceedings with different requirements.

Official legal sources

This article provides general legal information, not legal advice or a prediction of any case’s outcome. The proper charge, venue, evidence, defenses, and deadlines depend on the specific facts and documents. Philippine legal sources were checked as of July 24, 2026.