Can You Get an STD in a Long-Term Relationship? Risks You Might Overlook

Many people assume that being in a long-term, monogamous relationship eliminates the risk of sexually transmitted diseases (STDs). However, research from the Centers for Disease Control and Prevention (CDC) suggests otherwise: nearly 20% of STD transmissions occur within committed relationships.

Whether due to asymptomatic infections, past relationships, or infidelity, STDs can still be a risk in long-term partnerships. Even couples in exclusive relationships should consider regular testing to ensure their continued health and safety.

In this article, we’ll explore the hidden risks of STDs in long-term relationships, common misconceptions, and why getting tested together can be a smart decision.

How Can STDs Enter a Long-Term Relationship?

STDs don’t always originate from cheating - in fact, there are several other reasons why they can appear in a committed relationship. Here are the most common scenarios:

1. Undiagnosed STDs from Past Relationships

One of the most overlooked causes of STDs in long-term relationships is undiagnosed infections from previous partners. Many STDs, including chlamydia, gonorrhea, and HPV, can remain dormant for months or even years without causing symptoms.

For example:

• Chlamydia can stay asymptomatic for several years in both men and women.

• HPV (human papillomavirus) may not show symptoms for years but can still be passed on.

• Herpes (HSV-2) can be silent carriers, meaning a person can transmit it without experiencing any visible outbreaks.

If neither partner was tested before entering the relationship, an undiagnosed infection could resurface months or years later, causing confusion or even distrust.

2. Asymptomatic Carriers

Some people carry an STD without ever knowing it. Studies show that:

• 70% of trichomoniasis cases in men have no symptoms.

• Up to 80% of women with HPV don’t show any outward signs.

• 50% of men with gonorrhea never experience symptoms.

This means that someone could unknowingly pass an STD to their partner even in a long-term, faithful relationship. The only way to rule out an infection is through routine STD screening.

3. Incorrect Assumptions About Testing

Many couples assume that STD testing is only necessary for:
✅ New relationships
✅ People with multiple partners
✅ Those who experience symptoms

However, this belief leads to undiagnosed cases, as some STDs (like syphilis, gonorrhea, and HPV) don’t always cause immediate symptoms. Even if both partners feel healthy, they could still carry and transmit infections.

💡 Fact: A study found that 45% of couples never get tested after becoming exclusive - leading to the silent spread of STDs.

4. Infidelity (Even Past Infidelity)

While many couples trust each other, infidelity does happen. Studies suggest that:

• 20-25% of people in relationships have cheated at some point.

• In one-third of cases, the cheating partner did not use protection.

Even if a partner cheated years ago, any STD they contracted at that time could still be present today. This is why occasional testing can provide both peace of mind and protection.

What STDs Are Most Common in Long-Term Relationships?

Certain STDs are more likely to persist in long-term relationships because they can remain hidden or asymptomatic for extended periods. Here are the top culprits:

1. Chlamydia

• Often symptomless in both men and women.

• Can cause pelvic inflammatory disease (PID) if untreated.

• Can be present for years without detection.

2. Human Papillomavirus (HPV)

• The most common sexually transmitted infection.

• Some strains cause cervical cancer; others cause genital warts.

• Can remain dormant for years and suddenly appear later.

3. Herpes (HSV-1 & HSV-2)

• Can be transmitted even without active sores.

• 1 in 6 Americans has HSV-2, but many don’t know it.

• Some people get their first outbreak years after exposure.

4. Gonorrhea & Syphilis

• Can spread silently if not tested for regularly.

• Untreated infections lead to serious health complications.

These infections emphasize why testing - even in a committed relationship - is essential for long-term sexual health.

How Often Should Long-Term Partners Get Tested?

The CDC recommends that all sexually active individuals get tested at least:

• Once per year for common STDs like chlamydia and gonorrhea.

• Every 3-5 years for HPV (for women).

• Regularly if experiencing symptoms or changing sexual habits.

💡 Best Practice: Many couples test together once a year to eliminate any doubts and ensure mutual health.

How to Bring Up STD Testing in a Relationship

Discussing STD testing with a long-term partner might feel uncomfortable, but it’s a healthy and responsible choice. Here’s how to make the conversation easier:

✅ Start with a shared goal: “I think it’s important that we both stay healthy- how about we get tested together?”
✅ Normalize testing: “I read that a lot of people don’t realize they carry STDs. Let’s just check for peace of mind.”
✅ Make it about future plans: “If we ever want to have kids, it’s smart to make sure we’re both healthy.”

Many couples find that testing together strengthens trust and brings them closer rather than creating doubts.

Best Testing Option for Couples

For couples looking to test together, the Couples Testing Package from our partner stdcheck is an easy and confidential option.

✅ Comprehensive 10-Panel Test – Covers chlamydia, gonorrhea, syphilis, HIV, herpes, and more.
✅ Fast & Private – Results in 1-2 days, with no awkward doctor visits.
✅ Discount for Couples – Save money when testing together.

Final Thoughts: Protect Your Relationship with Regular Testing

Being in a committed relationship doesn’t mean you’re immune to STDs. Whether from past relationships, asymptomatic infections, or simple lack of testing, STDs can still appear unexpectedly.

The best way to protect your relationship and health is through regular STD screening - not just when symptoms appear, but as a routine part of your wellness checkup.

Sources:

• CDC: STDs and Long-Term Relationships

• National Library of Medicine: The Prevalence of Asymptomatic STDs

• WHO: Global STD Trends