Sex After STI Treatment — When Is It Actually Safe?

You finished the antibiotics. The lesions healed. The follow-up appointment went fine. But when is it actually safe to have sex again — and with whom?

It depends on the STI. Each has a specific post-treatment window. Here's the practical schedule.

Chlamydia

Wait 7 days after starting treatment. All of:

• 7 days after starting azithromycin (single-dose) treatment
• 7 days after completing the 7-day doxycycline course (so really 7+7 = 14 days from first dose)
• Both partners must have completed treatment

You don't need a test-of-cure to resume sex (CDC doesn't recommend routine TOC for uncomplicated chlamydia). But you should be retested at 3 months to catch reinfection — which is common.

Sex during the wait:

• No genital contact, no oral sex with genital exposure
• Kissing is fine
• Manual stimulation without genital contact is fine

See our doxycycline vs azithromycin guide.

Gonorrhea

Wait 7 days after completing treatment. Modern treatment is a single intramuscular ceftriaxone injection plus oral azithromycin (in some regions) — so 7 days from the injection date.

Same partner-treatment requirement: both partners completed.

Test-of-cure is recommended for pharyngeal (throat) gonorrhea — at 7-14 days post-treatment.

Syphilis

Wait 14 days after treatment AND until any visible lesions (chancres) are completely healed.

Sexual activity with any partner who has not been treated risks reinfection. All sex partners from the past 90 days (or longer depending on stage) must be tested and treated.

Follow-up:

• Blood RPR/VDRL titers checked at 3, 6, and 12 months to confirm cure
• Resumption of sex is fine after the 14-day mark + visible healing

See our syphilis pillar guide.

Trichomoniasis

Wait 7 days after completing metronidazole or tinidazole. Both partners must be treated.

No alcohol during metronidazole + 24 hours after (disulfiram-like reaction). Wait the full 7 days for safety.

Herpes (HSV outbreak)

Wait until the outbreak is fully healed. Specifically:

• All lesions completely crusted and healed
• No tingling, burning, or prodromal sensation
• Usually 7-14 days from first lesion appearance

For ongoing prevention between outbreaks:

• Daily suppressive valacyclovir reduces transmission risk significantly
• Condoms reduce risk further
• Asymptomatic shedding is reduced but not eliminated; no perfect protection

See our herpes pillar guide and valacyclovir guide.

HPV (active warts or recent removal)

Different rules than acute STIs.

If you have visible warts: skin-to-skin contact with affected area can transmit HPV. Wait until warts are removed and skin is healed. Even then, HPV may persist in skin without visible warts — transmission risk is reduced but not zero.

For partner protection:

• Condoms reduce HPV transmission risk by ~70% per partner-year
• Gardasil 9 vaccination for the partner provides forward-looking protection
• HPV often clears from skin within 1-2 years naturally

There's no "wait until X days" rule. Resume when comfortable and after wart treatment is complete.

HIV (newly diagnosed, starting ART)

No fixed wait period before sex, but several factors:

• Before achieving undetectable viral load: continue using condoms for partner protection. ART typically takes 3-6 months to reach undetectable.
• Once undetectable for 6+ months: U=U applies — no sexual transmission risk to partners.
• Partner can also start PrEP as additional protection during your transition.

See our U=U explained and PrEP vs PEP guides.

Hepatitis B

If newly acutely infected:

• Avoid sexual contact until non-infectious markers
• Most acute hepatitis B resolves within 6 months
• Partner should be vaccinated if not already

For chronic hepatitis B:

• Standard sexual activity is generally safe with vaccinated partners
• Pregnancy and breastfeeding considerations differ

Molluscum contagiosum

Wait until lesions are completely cleared. No partner-treatment requirement (most adults clear naturally over 6-18 months).

Use condoms over affected genital areas if sex resumes before complete clearance. The lesions are infectious through direct skin contact.

Pubic lice ("crabs")

24 hours after first treatment (permethrin or pyrethrin). Wash all clothing, bedding, towels.

Quick reference table

What if you have sex during the wait period?

• Risk of reinfecting yourself if partners haven't been treated
• Risk of transmitting to others
• For chlamydia/gonorrhea specifically: may make the treatment fail (re-exposure during the 7-day window is the main cause of post-treatment positives)

If you slip up, talk to your provider. They can extend treatment or retest at the appropriate window.

Partner notification timing

Your partner needs to be notified — and treated — for most STIs to actually be cleared. The CDC has expedited-partner-therapy protocols that allow your clinic to prescribe antibiotics for your partner without seeing them first.

Don't wait until you're "safe to have sex" to tell your partner. The notification window is much shorter:

• Chlamydia / gonorrhea: notify within 60 days of your diagnosis
• Syphilis: notify all sexual partners from past 90 days (or longer depending on stage)
• HIV: notify partners and consider PEP if exposure was within 72 hours
• Herpes / HPV / molluscum: ethical disclosure with current and recent partners

See our disclosure scripts page for how to handle the conversation.

Bottom line

The "when is it safe" question has a clean answer for most STIs — 7 days post-treatment, both partners completed, no remaining symptoms. Some (syphilis, herpes) require longer waits or visual confirmation of healing. Some (HIV, HPV) are managed with ongoing precautions rather than a fixed wait.

When in doubt, your provider can confirm based on your specific situation.

For more on testing schedules: STI testing window periods. For partner conversations: disclosure scripts.