In most states, yes — if you know you have herpes, you have to disclose it to your partner before sexual contact. Some states name herpes directly in their public health or criminal codes, others cover it under broader “communicable disease” or “sexually transmissible disease” language, and even in states with no statute on point, general tort law lets a partner who contracts the virus sue for battery, negligence, or emotional distress. So the practical answer to whether you have to disclose herpes to your partner is the same almost everywhere: tell them first.
When the Legal Duty Kicks In
There is no federal law requiring STI disclosure. The rules come from a patchwork of state statutes, tort principles, and public health regulations, and a CDC-funded analysis found that all 50 states have at least some statutory provisions related to sexually transmitted diseases.1CDC Stacks. State Statutes Explicitly Related to Sexually Transmitted Diseases in the United States, 2013
Almost every framework — statutory or common law — ties the duty to your knowledge of infection. If you’ve tested positive, been diagnosed by a doctor, or been notified by a health department, the duty is triggered. Many courts extend the standard to what you “knew or should have known,” so ignoring obvious symptoms or refusing to get tested after a partner’s diagnosis can also expose you to liability.
A positive test result triggers the duty even if you’ve never had a visible outbreak. Courts have held that herpes can be transmitted through asymptomatic viral shedding, and someone who knows they carry the virus has a duty to either abstain or warn a partner beforehand. No sores does not mean no duty.
Civil Lawsuits Are the Bigger Risk
For most people, the realistic exposure from non-disclosure is not a criminal case. It is a civil lawsuit, and a civil claim does not require proving you intended to infect anyone. Three theories come up most often.
Battery
If you knew you had herpes, did not disclose it, and had sexual contact that transmitted the virus, that contact can be treated as harmful or offensive touching. The reasoning is that your partner lacked the information needed to meaningfully consent. Someone who would have said no had they known the truth did not truly agree to the contact.
Negligence
A negligence claim does not require proof that you hid the diagnosis on purpose. The plaintiff must show four things: you had a duty to disclose or take precautions, you failed to do so, that failure caused your partner to contract herpes, and your partner suffered actual harm. In states with STI disclosure statutes, violating the statute can sometimes establish the duty and breach automatically under negligence per se.
Intentional Infliction of Emotional Distress
Where the conduct is extreme — lying about test results, continuing unprotected sex after a partner specifically asks about STI status, deliberately concealing an outbreak — courts may allow a claim for intentional infliction of emotional distress. The bar is high: the behavior must be so outrageous that a reasonable person would find it intolerable.
What Damages Look Like
Civil damages in STI transmission cases can be substantial. They typically include medical costs for treatment and ongoing antiviral medication, lost wages, and compensation for pain and suffering or emotional distress. Jury awards in herpes cases have sometimes reached into the millions. These cases are fact-intensive and emotionally charged, and juries sometimes respond strongly when they believe a defendant deliberately hid a diagnosis.
Criminal Consequences Are Narrower but Real
Criminal prosecution for herpes transmission is less common than civil litigation. Most STI-specific criminal statutes were written with HIV in mind, and relatively few states have criminal provisions that explicitly name herpes. Where herpes does fall under a criminal statute, penalties typically range from misdemeanor charges carrying up to six months or a year in jail and fines, to felony charges with longer prison terms in states that treat knowing exposure to a communicable disease as a serious offense.
The elements are demanding. Prosecutors generally must prove you knew you were infected, that you intended to transmit the disease or acted recklessly, that your conduct posed a substantial risk of transmission, and in some jurisdictions that the other person actually contracted the infection. The intent requirement is where most criminal cases either succeed or collapse. Reckless disregard is easier to prove than a specific intent to infect.
The recent trend has been toward modernizing and in some cases repealing STI criminalization laws, particularly for HIV. Several states have downgraded felony exposure statutes to misdemeanors or repealed them entirely. Reforms are uneven, though, and in states that still have aggressive statutes the consequences remain serious. Sex offender registration for a herpes-related conviction has very limited support; a small number of states impose registration for certain STI-related convictions, but this applies primarily to HIV and hepatitis exposure, not herpes.
Defenses That Actually Work
If you are facing a claim for herpes transmission, the defenses that hold up in court are narrower than most people assume.
- Lack of knowledge. If you genuinely did not know you had herpes — never tested positive, never diagnosed, never had symptoms — the duty was never triggered. This is the strongest defense, but it requires credibility. If your medical records show a positive test you claim you never saw, it falls apart fast.
- Informed consent. If you told your partner and they chose to proceed anyway, you have a complete defense. This is why many attorneys advise disclosing in writing. A text message is both the right thing to do and excellent evidence.
- Inability to prove source. If the plaintiff had other sexual partners during the relevant timeframe, or the timeline does not clearly support transmission from you, that creates reasonable doubt in a criminal case and weakens causation in a civil one. Herpes source-of-infection proof is hard: unlike HIV, phylogenetic analysis is not standard in herpes litigation, so plaintiffs typically rely on circumstantial evidence about timing and partner history.
- Use of precautions. Antiviral medication and condoms reduce transmission risk but do not eliminate it, since herpes can spread through skin contact in areas condoms do not cover. Using precautions without disclosure is generally not a complete defense, though it may reduce damages or undermine a claim of recklessness.
How Long You Have to Sue
Civil claims for STI transmission are subject to a statute of limitations. The deadlines vary by state and by claim type: negligence claims typically must be filed within two to three years, battery claims within two to four years, and fraud-based claims within two to six years. The clock usually starts when you discovered or reasonably should have discovered the infection, not on the date of the sexual contact. This “discovery rule” matters because herpes can remain dormant for months or years before producing symptoms, and some people only learn of their infection through routine testing long after exposure.
If you think you contracted herpes from a partner who hid their diagnosis, do not wait. Consult a personal injury attorney in your state to confirm the deadline. Missing the filing window means losing the right to sue no matter how strong the underlying claim.
How to Have the Conversation
The legal analysis and the practical advice point the same way: tell your partner before sexual contact, not after. A few things make that conversation less painful.
Choose a private, low-pressure moment. Not in the heat of the moment, not in a crowded restaurant, and not over text if you can help it, though a follow-up text confirming the conversation happened is smart for evidence reasons. Come prepared with basic facts: herpes is common, it is manageable with antiviral medication, transmission risk can be reduced with precautions, and many couples where one partner is positive navigate this for years.
Be direct. Something like “Before we go further, I want you to know I have herpes” works better than a long anxious preamble that signals something catastrophic. Most people’s mental image of herpes is worse than the medical reality, so having accurate information ready helps. Your partner may need time to process or ask questions. That is reasonable.
Frame it as a shared decision about sexual health rather than a confession. You are not asking for forgiveness. You are giving someone the information they are entitled to so they can make an informed choice, and most partners respond to that as respect.