Does Sperm Cause Yeast Infections? The Truth About Sex and Your pH

So, you've just been intimate with a partner and wake up the next morning to some burning and itching (à la Lovely Peaches). In more ways than one—because now you're also dealing with post-coital yeast infection panic.

Trust us, we’ve been there.

Yeast infections after sex are equally frustrating as they are stressful. And if they keep happening (noticeably post-intimacy), it's natural to wonder: is sex to blame for the discomfort?

Here’s your healthy dose of science, minus the shame.

Can you get a yeast infection from sex?

To clarify, yeast infections are not sexually transmitted infections (STIs). However, sex (both penetrative and oral) can trigger a possible infection.

For a yeast infection to occur, there must be an overgrowth of Candida, a naturally occurring yeast (or fungus) in the vagina. More often than not, the level of Candida is balanced and not a cause for concern. As such, sex itself cannot “give” you a yeast infection.

Rather, sexual activity (again, penile and finger penetration and oral sex) may introduce bacteria to the vagina, triggering the growth of Candida and potential infection.

A pertinent PSA: yeast infections are nothing to be ashamed of, nor do they mean you (or your partner!) are “dirty.”

Statistically, 75% of women are likely to be diagnosed with a yeast infection in their lifetime. Men, too, may be diagnosed with yeast infections. To that end, Candida infections affect all bodies, regardless of gender and preferred sexual activity.

Can sperm cause yeast infections?

Just as sex cannot “give” you a yeast infection, neither can sperm.

However, semen’s alkaline pH (or, a basic pH that may fall between 7.1 and 8.0) alters the vagina’s acidic pH (or, a low pH that may fall between 3.8 and 4.5) when the two come into contact, triggering Candida overgrowth.

A bit more scientifically, semen elevates the pH of the vagina, inhibiting the production of Lactobacilli (a protective bacterium that regulates the growth of Candida), and the vaginal microbiome is disrupted.

Just a quick note: All bodies are different! Though semen temporarily raises the vagina’s acidic pH, your body may not contract a yeast infection post-(unprotected) sex.

Alternatively, some bodies are a bit more sensitive to the disruption of their vaginal microbiome and may contract yeast infections more easily.

Ultimately, you know your body best. If you ever feel that something is “off,” do not hesitate to seek treatment.

Why do I get yeast infections after sex?

Post-sex, yeast infections may be a product (or combination!) of any of the following:

• Friction and micro-tears in vaginal tissue: Though the vagina is elastic and often resistant to tears, vaginal tears may occur, particularly during rougher sex or when the vagina is not sufficiently lubricated, disrupting the vaginal microbiome.
• Introduction of new bacteria (mouths, fingers, and toys included): The transferring of “normal flora” (or, naturally occurring bacteria) from the hands and mouth to the vagina similarly alters the vagina’s pH; as do toys, if not properly cared for.
• Condoms with spermicide or flavored lubes: Spermicides and lubes possess compositions dissimilar to the vaginal microbiome and may upset its pH as well.

To briefly return to the stats, 45% of women are likely to have more than one yeast infection, and one or two diagnoses, here and there, should be normalized.

However, recurrent infections (that is, four or more a year) may be indicative of underlying conditions and necessitate a consultation with your physician. Both diabetes and a compromised immune system may increase the likelihood of recurrent infections.

Can leaving sperm in overnight cause yeast infection?

Though sperm itself cannot cause yeast infections, the longer it remains in the vagina (say, overnight), the longer the pH disruption. Vaginas are self-cleaning, yes, but the alkaline environment, induced via sperm, persists, and yeast infections may fester.

As such, it is best practice to urinate post-sex and externally wash your vagina (never, ever douche!) to maintain a balanced microbiome.

How to prevent a yeast infection after sex

If sexually active, gynecologists recommend the use of condoms, whether internal or external, to prevent possible yeast infections. Condoms both reduce semen exposure and (bonus!) ensure an easier cleanup post-sex.

If using lube, glycerin and water-based lubes are recommended, as they are less likely to disrupt the vaginal microbiome.

Post-intercourse, it’s best practice (for both parties) to urinate, flushing the urethra and external regions of lingering bacteria. To that end, communicate with your partner(s) about their hygiene. You deserve to have healthy and pleasurable sex.

Preventative measures you may implement a bit more regularly (or those that are not necessarily related to safe sex practices): wearing breathable cotton underwear (or none!) to bed and taking probiotic supplements with Lactobacillus strains.

Moreover, you might consider tracking your cycle, as yeast infections occur, more commonly, during the luteal phase (or, the stage just between ovulation and menstruation).

Just a(nother) quick note: aftercare (and cleanup!) should very much be practiced with your partner for both intimate and hygienic purposes. That said, consider foregoing a post-sex bubble bath.

Scented products should always be avoided when cleaning your vagina; even more so when it’s been exposed to unfamiliar bacteria.

Can sperm cure yeast infection?

No! Sperm cannot cure yeast infections!

Recall that sperm, relative to the vagina, possess a more alkaline pH. Accordingly, semen, instead, destabilizes the vaginal microbiome, triggering a possible yeast infection.

Moreover, should you have sex while receiving treatment, you may risk your symptoms worsening and spreading the infection to your partner.

Let’s negate another prevailing notion: male partners can receive (and share!) yeast infections, too. Yes, really!

As such, it’s best practice to abstain from sex during treatment for both comfort and effectiveness.

When to see a healthcare provider

Though occasional yeast infections are very much normal, if you receive four or more diagnoses in a year, you may have a recurrent infection and should consult a medical professional.

Unsure if you have a yeast infection? Let’s review its symptoms!

Yeast infections, per the Mayo Clinic, may manifest as irritation at the entrance of the vagina; a burning sensation when urinating; and a discharge similar in color and texture to cottage cheese.

Just a quick note: BVs, STIs, and allergic reactions may have symptoms similar to those of yeast infections; hence the necessity of a proper diagnosis.

If you happen to have recurrent infections, though no underlying condition, it might be time to consider partner treatment. That is, your partner may have a sensitivity to yeast infections (and is, instead, sharing the infection) that should be treated.

Fortunately, seeking medical consultation has been both streamlined and made a bit more accessible as of late. Wisp, and other such digital healthcare platforms, offer telehealth services for those unable to schedule in-person appointments.

Putting the sperm-yeast infection connection to rest

To briefly recap, sperm can trigger yeast infections, particularly by disrupting the vagina’s pH, though it is not the sole factor to cause yeast infections.

As such, self-advocacy for and open communication regarding our bodies are imperative. Whether diagnosed with a yeast infection or experiencing symptoms that are decidedly not normal (for your body!), sexual health concerns are both valid and common.

In line with self-advocacy, consult a healthcare professional to receive treatment tailored to your body if you happen to notice anything amiss. Remember, no one body is the same.

Here’s to healthier (and happier!) vaginas!