Medical Oncologist
Sex and relationships
Is sex safe during chemotherapy?
Usually yes, but not at every point in the cycle. When white cells are very low, infection risk rises; when platelets are very low, bleeding and bruising are more likely. These lows often fall in the middle of a cycle. Ask your team what your counts are and when they are expected to recover, rather than avoiding intimacy throughout.
NG
Medically reviewed by Dr. Naresh GunduConsultant Medical Oncologist · MBBS, DNB (Internal Medicine), DM (Medical Oncology, AIIMS) · last reviewed September 2026, next review due September 2027
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The short answer
When is sex riskier during chemotherapy?
Sex is usually safe during chemotherapy, but two blood counts decide how safe it is at any given time. The first is your neutrophil count, the white cells that fight infection. When it is very low, the small breaks in skin and the lining of the vagina, penis or anus that happen during sex can let bacteria in, and an infection can become serious quickly. The second is your platelet count. When platelets are very low, even gentle friction can cause bleeding and bruising that is slow to stop.
For many chemotherapy treatments, both counts are at their lowest in the middle of the cycle, often a week or two after the treatment day, and recover before the next cycle. This low point is sometimes called the nadir. Rather than avoiding intimacy for the whole course, it helps to ask your team when your counts are expected to be lowest, what your recent results showed, and whether there are any days when intercourse should wait. Outside those days, with contraception and barrier protection after each dose, sex is usually fine. This page explains the principles; your team can apply them to your treatment and results.
Counts differ between treatments
Some treatments lower counts a lot, others hardly at all. Weekly treatments may keep counts low for longer.
How you feel is a guide too
Fever, tiredness, mouth sores or feeling unwell are signs to wait, whatever the calendar says.
Anal sex carries more risk
The lining of the rectum tears easily and carries more bacteria, so it is best avoided when counts are low.
Ask your team which days of your cycle counts are usually lowest, and whether your last blood test showed very low white cells or platelets.The risks explained
Infection, bleeding and other considerations
- Infection risk with low white cells
- Tiny tears can let bacteria in. Urine infections, genital infections and skin infections are more likely and can become serious. Your team may advise avoiding intercourse when neutrophils are very low.
- Bleeding risk with low platelets
- Friction can cause bleeding from the vagina, penis or anus, and bruising. Intercourse may need to wait until platelets recover.
- Mouth sores and oral sex
- Mouth sores increase infection risk for both partners. Avoid oral sex until sores heal.
- Sexually transmitted infections
- Infections such as herpes can flare or be more serious with low immunity. Condoms reduce the risk.
- Traces of medicine in body fluids
- For the first few days after each dose, use a condom or dental dam to protect your partner.
- Pregnancy
- Pregnancy is still possible and dangerous during treatment. Use reliable contraception.
Not sure whether this applies to you?
Ask an oncologistStep by step
How to plan around your counts
Ask about your low point
Ask your team when your counts usually drop lowest in each cycle and when they recover.
Check your latest results
Ask whether your last blood test showed very low neutrophils or platelets, and what that means for intimacy.
Use precautions every time
Use condoms or dental dams for the first few days after each treatment, and reliable contraception throughout.
Choose gentle options on low days
On days when counts are low, choose cuddling, massage and touch that avoids friction and penetration.
Watch for warning signs afterwards
Report fever, bleeding, burning urine or new genital symptoms the same day.
!
Get help the same day, or immediately, for any of these
Fever or shivering · bleeding from the vagina, penis or anus that does not stop · heavy bleeding or large bruises when platelets are low · burning or pain when passing urine with fever · new genital sores, blisters, swelling or unusual discharge · severe pain in the pelvis or rectum. Call your chemotherapy helpline, or go to the nearest emergency department for heavy bleeding or fever, and say clearly that the person is on chemotherapy.
Being straight with you
What this page cannot tell you
It cannot tell you your counts or whether they are low enough to avoid sex. That depends on your blood results and treatment, and your team gives the specific advice. This page does not give count thresholds, because the safe level depends on your situation.
It also cannot tell you exactly when your counts will be lowest. The timing varies with medicines and between people, and your team can explain your pattern.
Hygiene helps reduce infection
Washing gently before and after sex, passing urine afterwards and using clean lubricant reduce infection risk.
Avoid shared sex toys when counts are low
If you use them, keep them clean, use a condom over them, and do not share them during low-count periods.
Growth factor injections change the pattern
If you receive injections to boost white cells, counts may recover sooner. Ask how this affects your plan.
Blood thinners add to bleeding risk
If you take blood thinners, bleeding may be more likely, especially with low platelets.
Radiotherapy to the pelvis
Pelvic radiotherapy can make tissues sore and fragile. Ask your team when intercourse is safe.
Children and older couples alike
These principles apply at every age and in every relationship.
Asking is not embarrassing
Your team would much rather answer a question than treat a preventable infection.
Partners can ask too
A partner can come to an appointment and ask about safety directly.
Stay close on low days
Low counts do not mean no intimacy. Touch, massage and closeness are safe and important.
Keep a simple cycle calendar
Marking treatment days, blood test dates and the days your team says counts are usually lowest on a calendar helps couples plan intimacy without guessing. It also helps you notice if symptoms such as fever or bleeding follow a pattern.
After a fever or infection
If you have recently had an infection or needed antibiotics, ask your team when it is safe to resume sex, as counts and healing may take a little longer.
Low counts and genital infections
When counts are low, even minor genital infections such as thrush or a urine infection can spread or become more serious. Treat itching, burning or unusual discharge promptly, and avoid sex until symptoms have settled and your team agrees it is safe again.
What to do next
Ask your team when your counts are lowest and what your last results showed, avoid intercourse on very low-count days, use condoms and contraception, keep hygiene simple, and report fever, bleeding or genital symptoms promptly.
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Commonly believed
Four beliefs about sex and blood counts
"Sex must stop for the whole of chemotherapy."
Most restrictions apply only on low-count days. Outside those, sex with precautions is usually safe.
"If I feel fine, my counts must be fine."
Low counts often cause no symptoms. Ask about your blood results.
"Condoms are only for preventing pregnancy."
They also protect your partner from medicine traces and reduce infection risk.
"Any bleeding after sex is normal during treatment."
Bleeding that does not stop, or heavy bleeding with low platelets, needs prompt attention.
Questions we are asked
Common questions about safety and counts
Is there an infection risk from sex during chemotherapy?
Yes, especially when white cells are very low. Tiny tears can let bacteria in. Your team may advise waiting until counts recover.
Is there a bleeding risk?
When platelets are very low, sex can cause bleeding and bruising. Intercourse may need to wait until they recover.
Which days should I avoid sex?
Usually the days when your counts are lowest, often mid-cycle. Ask your team about your pattern.
Which counts matter?
Neutrophils, for infection risk, and platelets, for bleeding risk. Your team can explain your latest results.
Is anal sex safe?
It carries more infection and bleeding risk and is best avoided when counts are low. Ask your team for advice.
What should I do after sex to reduce risk?
Pass urine, wash gently, and watch for fever, bleeding or burning urine.
Are we allowed to be close on low-count days?
Yes. Hugging, touch, massage and lying close are safe at any time.
Should I still use condoms if I cannot get pregnant?
Yes, for the first days after each dose to protect your partner, and to reduce infection risk.
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Sources
- Cancer Research UK — Sex and chemotherapy
- American Cancer Society — Sex and the Woman With Cancer
- American Cancer Society — Sex and the Man With Cancer
This page is general information, not a prescription. Do not change or stop any treatment based on what you read here. If anything is worrying you, contact your own treating team — or call our helpline and we will help you reach the right specialist.
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