A new study has exposed the sexual health habits of some Americans.

Researchers analyzed data from the U.S. Census Bureau to determine how and where Americans have been contracting and spreading STIs (sexually transmitted infections), also known as STDs (sexually transmitted diseases).

Among the findings from DatingNews.com was the fact that 55% of people with an STI contracted it from a cheating partner.

TESTOSTERONE THERAPY COULD HELP BOOST WOMEN'S SEX DRIVE AS THEY AGE, BUT RISKS EXIST, EXPERTS SAY

Thirteen percent of the nearly 1,000 respondents said their partner has lied to them about their STI status, while 45% did not discuss testing with their partner before becoming sexually active.

Nearly one in five (18%) of respondents said they had been diagnosed with an STI, with the most common diagnosis, chlamydia, making up 36% of the cases.

The survey participants ranged in age from 18 to 79, DatingNews.com spokesperson Emily Fanous told Fox News Digital.

Since 81% of Americans over 18 are sexually active, Fanous emphasized the importance of knowing one's risk — and how getting testing can aid in prevention.

FIRST AT-HOME SYPHILIS ANTIBODY TEST GETS FDA AUTHORIZATION AS STD CASES SPIKE IN US

One in three Americans in the study said they have never been tested for an STI.

The largest number of untested individuals were baby boomers (51%), followed by millennials (33%) and Gen Z and Gen X (both 29%).

The main reasons respondents said they've refrained from testing are embarrassment (25%), lack of time (22%) and cost (19%).

Dr. Gabe Gaviola, M.D., senior medical director at Everlywell in New York — an at-home STD testing and treatment platform — noted that there are more than 20 million new cases of STIs reported in the U.S. each year.

"The real surprise from these findings is the lack of STI testing that could prevent new cases," Gaviola, who was not involved in the study, told Fox News Digital during an on-camera interview. (See the video at the top of this article.)

"As a doctor and public health advocate, I wish more people knew that there are affordable at-home STI lab testing options that provide quick, reliable results with the privacy and convenience of collection at home."

The study also found that only 34% of people get annual STI testing, while fewer than 25% get tested before entering a new relationship.

"Those numbers aren’t high enough," Gaviola said. "Many STIs don’t present any symptoms, which means you shouldn’t wait for symptoms to get tested." 

The research also revealed the U.S. states that have the most STI and STD cases.

Mississippi has the highest rate, at 1,187 diagnoses per 100,000 people, followed by Louisiana at 1,145, Alaska at 1,066, South Dakota at 993 and Georgia at 975.

Fanous encouraged those in states with high rates to consider being tested if they are sexually active.

For more Health articles, visit www.foxnews.com/health

"These findings show that too many people are not prioritizing their sexual health," Gaviola said. 

"Whether it’s because of stigma, access or education, millions of Americans who are at high risk of getting or transmitting an STI are not getting tested."

"We need to advance the conversation around sexual health and increase education about the importance of STI testing."

Everlywell is teaming up with the American Sexual Health Association for the first-ever National Get Tested Day on Sept. 30.

"Our goal is to educate and break down barriers to accessing this essential health care," Gaviola said. 

"Testing is the first step in empowering people with important information about their sexual health."

Gaviola added that even people in long-term, monogamous relationships should stay up to date on STI testing.

CLICK HERE TO SIGN UP FOR OUR HEALTH NEWSLETTER

"Many STIs don’t present any symptoms, but if left undetected and untreated, they can lead to serious long-term health issues, such as infertility," he cautioned.

The expert encouraged Americans to have open conversations with their partners before entering a sexual relationship and to "keep checking in."

"This helps establish trust that they are taking their sexual health as seriously as you are by getting tested regularly," he said.

Republican vice presidential nominee JD Vance took an apparent jab at Democratic presidential nominee Kamala Harris during an event in Michigan, when he echoed a talking point about her upbringing that she often repeats at her own events.

When speaking to a group of supporters in Traverse City, Vance mentioned he also "grew up in a working class family" and knows what it takes to stand up for the middle class in an election year unsettled by high inflation and crippling costs.

"Now, look, a lot of you know my story and a lot of you know where I came from. Look, I grew up in a working-class family. And so, when the Democrats — when Kamala Harris — talks about her middle class background, when the Democrats talk about how they stand for working people, they're not telling the truth," Vance said.

He added: "They're lying to you."

HARRIS-TRUMP SHOWDOWN: NEW POLL INDICATES WHO HAS EDGE IN MOST IMPORTANT BATTLEGROUND

In his remarks, Vance said voters can look back to how many Democrats in positions of power during the COVID-19 pandemic sought to enforce lockdowns and to keep them in place while Americans were desperate to return to work.

"Here's how we know they're lying to you," he continued. "Remember back a few years ago when there were a lot of nurses, a lot of people in a lot of industries that were losing their jobs because they refused to take the COVID shot? Now, I believe if you want to take the Covid shot, take the shot. If you don't want to take the COVID shot, don't take the COVID shot. But listen, it is disgraceful for Kamala Harris to say that she stands for the American working man when she fired millions of American working men and women from their jobs for not doing what Kamala Harris would tell them to do."

Vance was visiting Michigan as the state represents an important background for former President Trump’s re-election chances and for down-ballot races like former Rep. Mike Rogers, who is running to represent Michigan in the U.S. Senate.

WHAT THE LATEST FOX NEWS POWER RANKINGS IN THE 2024 ELECTION SHOW

After commending Rogers, Vance turned his attention to the current vice president.

"I don't know if you saw the news but Kamala Harris has decided to give her first solo national interview," Vance said. "I've watched a couple of these interviews, local journalists with Kamala Harris, and I've realized why it is that Kamala Harris doesn't give interviews. And the answer is that every time she answers a question, I think we gain about 100,000 votes, me and Donald Trump."

"They ask Kamala, of course, because she's the vice president and she is the reason why we have sky-high inflation and a wide open border, what are you going to do? What is your specific plan to solve the inflation crisis that's making it unaffordable to buy groceries and housing? And Kamala will say, well, did you know that I grew up in a middle-class family, I had a very nice lawn back there in Berkeley, California," he continued. "It's like, well, that might be true. What the hell does that have to do with lower inflation?"

Vance added: "Or they'll say, Kamala Harris, we've got a war in every new continent across the country. Kamala Harris, your administration has in some ways led to the policies that caused this conflict. How are you going to solve it as President of the United States? And Kamala Harris will say, well, did you know that I worked at McDonald's for about three months when I was a teenager?"

THIS PRESIDENTIAL CANDIDATE HAS THE UPPER HAND IN THE 2024 CASH DASH

The Republican senator’s tirade against the Democratic nominee by arguing she fails to offer specifics in her answers.

"I think my friends, all of us watching this interview are saying to ourselves, what is Kamala Harris? What is she actually planning to do for the American people? And the answer is we don't know. [But] we don't have to guess that much because she's been the vice president for three and a half years and she hasn't done a thing. So let's dispense with this idea that Kamala Harris is going to fix the very problem she caused."

And, "Kamala Harris is why we have sky-high inflation. Kamala Harris is why you can't afford groceries or housing. Kamala Harris is why the world is at war right now in nearly every single continent. Kamala Harris is why the border is wide open. And Kamala Harris, you want a promotion? The message from Michigan is you're fired. Go back to San Francisco where you belong."

Michigan, along with Pennsylvania and Wisconsin, are the Democrats' so-called "blue wall," which the party reliably won for a quarter-century in presidential elections.

This stronghold completely crumbled during Trump’s successful 2016 presidential run, when he narrowly carried all three states. However, Biden narrowly won back all three states in 2020.