Do you have to tell someone you have herpes?

The ethical case, stated plainly

A partner can only consent to the sex they know they are having, and genital herpes is a fact about what that sex can transmit. That is the whole argument, and it holds even on a day you feel fine, because the virus sheds between outbreaks. "I would tell them if there were any risk" does not work when you cannot personally guarantee a no-symptom day is a no-risk day. The shedding guide has those numbers.

Telling is also the cheaper choice every time. An undisclosed diagnosis is a bomb with a long fuse: it goes off at the moment a partner connects a diagnosis to you, or the moment you realize what the relationship was built on. When you do tell, explain the precautions you actually use and give the study results with their limits, not a percentage invented to sound reassuring, and then leave room for the other person to ask questions and decide.

Where the law actually stands

Patchy, mostly written for HIV, and a poor place to take your moral cues. Some states allow civil suits for knowingly exposing someone to a sexually transmitted infection, and a few have criminal statutes that could reach herpes in theory. Prosecutions specifically for herpes are rare, but they exist, and the publicized ones have generally turned on knowing exposure without disclosure.

Two practical notes follow from that. "Do I have to" is the wrong test, because the legal floor is a low and unclear bar and nobody is proud of building to the minimum. And the fact that ends every bad version of this is the same one: "they knew I had it", said plainly, before contact. If a specific state's law matters to your situation, a local clinician or a lawyer can tell you what applies there; this page will not guess a statute it has not read.

The two gray areas

Most versions of this question are clear. Two are genuinely not.

The first is oral HSV-1, the cold-sore virus, and kissing. In the CDC's 2015 to 2016 survey, 47.8% of Americans aged 14 to 49 carried HSV-1, most without knowing, and social norms have never demanded a formal disclosure before a kiss. The workable standard is: never kiss or give oral sex during a cold sore or the tingle before one, mention it casually when things head toward intimacy, and skip the ceremony for a kiss. The kissing guide covers it in full.

The second is when both partners already carry the same virus. If you both have genital HSV-2, protecting a partner who already has it is no longer the disclosure question, but confirm both diagnoses actually match on type and location first, because HSV-1 and HSV-2 in different places can still be passed. When both partners have herpes has the studies behind that.

How to do it well

Before sexual contact, not in the bedroom and not after. Keep it calm, factual, and brief: a fact, not a confession. Say the type and site, that it can spread without symptoms, and the precautions you take, and then accept their answer. A no delivered with respect is survivable for both of you; a persuasion campaign is not. The first-disclosure guide covers timing and wording, and the script builder drafts a version for your situation in about thirty seconds.