Some people may not recognize their symptoms as an allergic reaction. Allergy symptoms can be similar to the physical changes that happen during sex, including a fast heartbeat, sweating, swelling, and flushed or tingly skin.
Some people might not seek care for an allergic reaction to sex because they feel a bit uncomfortable bringing it up with a doctor. But allergic reactions can worsen over time. Severe reactions can even cause hives, breathing problems, and anaphylaxis, which can lead to death.
This article explains some of the causes of allergic reactions during sex. It also provides some guidance about when to seek medical help.
Latex Allergy
A latex allergy is triggered by the material that most condoms, those put on the penis or inserted into the vagina, are made of. It can affect one or both partners.
Symptoms of latex allergy include:
ItchingBurningRashUticaria or hivesSwellingAsthma symptomsAnaphylaxis
Usually, these symptoms occur within seconds to minutes of latex exposure. In some cases, they can occur many hours later. The skin exposed to latex can even blister.
Treating the allergy means avoiding latex. Polyurethane condoms and SKYN non-latex condoms made from polyisoprene are good alternatives, as they protect you from pregnancy and sexually transmitted infections (STIs).
Non-latex condoms made of lamb intestines are also available. They can prevent pregnancy, but they don’t protect against STIs.
Product Ingredients
Lubricants and spermicides may have scents, dyes, preservatives, or other ingredients that can cause an allergic reaction with itching.
Underwear or tights with certain dyes, as well as cleansing wipes you might use after sex, can also cause a reaction.
Even if you’re not having a true allergic response, your body may be sensitive to one or more ingredients, which can cause similar symptoms.
Seminal Fluid Allergy
Allergic reactions to semen are extremely rare. Proteins in the fluid, not the sperm, cause most of these reactions. It is also possible for semen (and saliva) to contain traces of foods or medications that are allergens.
You can be allergic to one person’s semen, but not another’s. It’s also possible to be allergic to more than one partner’s semen. In some cases, people react to semen that has never caused an issue in the past.
A semen allergy can cause:
Itching and burning within 30 minutes of sexHives or swellingAsthma symptomsAnaphylaxis
Skin tests and blood allergy tests can determine if you have an allergy to seminal fluid. If you do, you can use condoms to avoid coming into contact with it.
Some people can be gradually de-sensitized to an allergen. That involves exposure to the allergen in increasing amounts over time.
This approach may be a good one if you’re trying to get pregnant. There are also ways to “wash” sperm during fertility procedures so allergens are removed.
If you have a history of severe reactions, you should not try to de-sensitize on your own. Work with a physician so the process is safe for you.
Other Causes of Itching After Sex
Sometimes post-sex itching isn’t caused by an allergy. If you have symptoms that don’t go away in a day or so, talk to a healthcare professional.
Some of the possible causes may need prescription treatment.
Dry or Irritated Skin
If your skin tends to be on the dry and flaky side, you may have some itching after sex. This may be true if you:
Didn’t use enough lubricant during sexWere not aroused enough during sexUsed products with fragrance or dyesWashed with a drying soapHave a health condition such as eczema or diabetes
Hormonal changes can also make the skin on the vulva and vagina drier. That can happen if you’ve just had a baby or you’re in menopause.
Some medications can also change the fluids in your vagina. Birth control pills and antidepressants are two examples.
pH Levels
A pH level is a measure of how acidic something is. A healthy vagina usually has a pH of 3.8 to 5.0, which is slightly acidic. When the pH is in that range, it limits the growth of microbes that could cause infections.
If the pH gets too high, your risk of infection also goes up. Some of the things that can change the vagina’s natural pH are:
Having unprotected sex, because semen is more alkalineTaking antibiotics, which can destroy some of the “good” microbes that prevent infectionDouching or over-cleansing the vagina, which strips the vagina of its good bacteriaHaving a period, because menstrual blood raises pH
Infection
One of the most common causes of itching after sex is infection. Parasites, bacteria, and fungi (yeast) can cause:
ItchingBurningDischarge
These symptoms may be more intense after you’ve had sex. Depending on the cause, an over-the-counter medication could stop the itching. But many infections need to be treated with prescription medication.
STIs
Some infections are passed from person to person through sex. Many STIs don’t cause any symptoms at first. For that reason, you can pass them to a partner without realizing it.
Itching is a common symptom of many STIs, including:
Chlamydia Genital herpes Gonorrhea Human papilloma virus (HPV) Trichomoniasis
If you have itching for more than a few days after having sex, it’s a good idea to get tested to find out if you have an STI. If you do, you will likely need prescription medication to treat or manage it.
How to Treat Post-Sex Itching
Here are a few options that may put a stop to your itching:
Switch the type of condom you’re using. Other materials may not trigger a reaction. Stop having sex for a few days to see if the symptoms ease. Use more lubrication or slow sex down to allow your body’s natural fluids to flow. Keep your body clean and dry. Wearing loose, breathable clothing throughout the day may help. Avoid products with fragrances or irritants.
If the itching stems from an infection, those steps won’t fix the problem. You’ll need to see a healthcare provider for an accurate diagnosis and treatment plan.
Depending on your diagnosis, you may need one of these medications:
AntibioticsCorticosteroids (anti-inflammatory drugs)Antiviral medicationsAnti-fungal medications
Other Allergic-Type Reactions to Sex
You could be having a reaction that looks and feels like an allergy, but isn’t an allergy to sex.
Vasomotor rhinitis is congestion, runny nose, and sneezing after sex. (In fact, it’s sometimes called “honeymoon rhinitis.”)
It happens when nerves and blood vessels in your nasal passages are stimulated. This condition may have something to do with the strong emotions sex can stir up.
Some people use a nasal spray (ipratropium bromide) about an hour before sex to prevent this problem.
Post-orgasmic illness syndrome (POIS), another possibility, is a very rare reaction. Within a few seconds to a few hours after ejaculation, allergy or flu-like symptoms occur. They can include:
Itchy eyes Congestion Headache Fatigue
POIS is more common in people with a penis. Researchers aren’t sure exactly what causes it.
Summary
It’s rare, but not impossible, to have an allergic reaction during sex. Latex, fragrances, preservatives, or proteins in semen can cause itching and other symptoms. Dry skin, pH changes, and infections can also cause reactions.
Symptoms often go away in a day or so. If they don’t, it’s important to see a healthcare professional. Allergies can often be treated so you don’t have to deal with the itch after sex. If an infection is making you itchy, you may need medication to cure the problem.
A Word from Verywell Health
Talking about a sex-related allergy can be sensitive. For some people, symptoms like genital itching can feel highly personal or even embarrassing. It may help if you start by telling your healthcare provider that you feel nervous or vulnerable. It may also help to write down your questions in advance. However you choose to frame the issue, speaking up is the best way to solve the problem and protect your health.
