Here's why having sex with a new partner can change the smell of your vagina

You just had sex with someone new. Fun!

Why A New Sexual Partner Can Affect Vagina Smell

And you thought you knew yourself pretty intimately and all of your bodily scents! So now you're here, hunting for answers.

First, dont panic: An unfamiliar smell coming from your vagina might be nerve-wracking, but there are a whole bunch of possible reasons behind a change in odor that are no big deal. Here's everything you need to know.

With or without a new sexual partner, that is. As you probably know, your vagina naturally has a certain smell. It always does-you just probably dont notice it most of the time because you're used to it. That smell is based on the specific pH of your vaginal discharge, says Nicole Bullock, DO, an ob-gyn in Texas. (Remember back to chemistry class for a second: pH is a scale of acidity.)

If something comes in and throws your vaginas pH off, its going to change the smell of your discharge, Dr. Bullock says. Don't stress, though, because the change is often totally benign.

All sorts of factors can affect vaginal pH, so you may not be able to pinpoint the exact cause. The smell can change based on where you are in your menstrual cycle , if youre on hormonal birth control , if youre going through menopause, if youve eaten certain foods like garlic or asparagus, how much youve been drinking, and on and on, Dr. Bullock says.

This is especially the case if youre not using barrier methods of protection . With a new partner, you have a different chemical mix, she says. Thats especially true if your partner has a penis, as vaginal fluid tends to be on the acidic side of the pH scale, and semen tends to be on the alkaline side. So, when you get a new persons semen all up in your vagina, it can temporarily change how you smell down there. Its not good or bad, its just different, Dr. Bullock notes.

While its less likely, your vagina may also smell differently if your new sex partner also has a vagina. No two vaginas are the same, so if you end up getting your partners vaginal fluid inside your vagina, it could temporarily change the pH, according to Dr. Bullock. This can happen if your partner was touching their vagina and then inserts their fingers inside of yours, or if you used a toy on your partner and then didnt wash it before using it on yourself (but, in the future, PLEASE wash it ).

A change in smell might mean youve contracted an STI from a partner. Not all sexually transmitted infections cause a distinct odor, but one does. Trichomoniasis is a common STI caused by a parasite that typically passes from a penis to a vagina, or vice versa, during sex. It happens less often, but the parasite can also pass from a vagina to another vagina, according to the Centers for Disease Control and Prevention (CDC) .

About 70 percent of people who have trichomoniasis dont feel any symptoms, the CDC says. But those who do have symptoms may notice itchy, red, and burning genitals , pain when they pee, and vaginal discharge that looks and smells strange; discharge may be thinner than usual, yellow or green-ish, and have a strong odor. Without treatment, trichomoniasis can last for months or years, according to the CDC, and you risk spreading the parasite to other sexual partners.

But treatment is easy: If youve noticed that your vagina smells funny, is itchy, and your discharge looks strange, get yourself to your doctor. Theyll do a lab test to make sure you really do have the STI and then prescribe you medication (either metronidazole or tinidazole) if you do. Wait seven to 10 days before you have sex again, and make sure your partner knows that you had the STI so they can get treated.

Your vagina (and the rest of your body) is full of bacteria-most of it is good bacteria that helps our bodies function. Good bacteria, we want, Dr. Bullock notes. We dont want bad bacteria or yeast to grow. Typically, the good bacteria in your vagina keep the bad bacteria in check. But that can change if you do something to throw them off their game, like using a vaginal douche or wearing a pad for too long, she says.

And suddenly changing up your sexual routine with a new partner, or just having more sex, can disrupt your vaginal bacteria, Dr. Bullock says. Sometimes people are single for a year and then they start a new relationship and now theyre having sex every day, she explains. Sex every day is awesome, of course, but that might mean your vagina is suddenly enveloped in latex and lube and bodily fluids way more frequently than it was before. All of this can cause what's known as bacterial vaginosis (BV).

If your vagina smells distinctly fishy, BV is a pretty good guess. The infection is caused by an overgrowth of bad bacteria in the vagina. But it isnt necessarily an STI because its not clear whether its passed through sex, according to the . Trichomoniasis and BV also itching, burning, painful urination, and thin vaginal discharge.

BV is treatable and not dangerous, but you should see your doctor to get properly diagnosed and prescribed the appropriate meds to help kick it (and reduce the change of a recurrence).

If the smell is due to a new partners semen or other fluids mixing with your vaginal fluid, then itll probably go away within a couple hours, Dr. Bullock says. And you can expect a similar timeline with triggers like food and alcohol.

The vagina is a pretty self-sufficient environment, Dr. Bullock says. Translation: The less you mess with it, the better. So dont actively try to get rid of the smell with a douche or by washing your vagina with soap (that could just make things worse).

In the case of an STI or bacterial vaginosis, the smell is probably going to linger until you get it properly treated. That means youll want to hit up your gynecologist any time a new smell is just one of your symptoms. If your vagina is itching, burning, or red on top of having an odd odor, make an appointment with your MD.

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