Why Some People Sweat More Than Others

Some people sweat more than others. Exercise with a group, and the differences become obvious.

But what determines these variations?

Answers have traditionally focused on factors like body fat percentage (more fat insulates you and makes you overheat sooner) and aerobic fitness (the fitter you are the less you sweat).

At the American College of Sports Medicine meeting this spring, Matthew Cramer of the University of Ottawa and Ollie Jay of the University of Sydney presented some results that challenged those ideas. That data has now been published in the Journal of Applied Physiology, and it has some surprising twists.

The problem with previous studies is that body fat and aerobic fitness (VO2 max) tend to correlate with other factors. People with lots of body fat tend to weigh more—so is it the insulative properties of fat that matter, or is it simply being bigger and having to haul around more weight?

The Scientific Key to Giving Her Multiple Orgasms

Only 47 percent of women have ever had multiple orgasms, according to a new study from researchers at Indiana University and the sex-ed site OMGYES.

Want to change that?

Researchers asked the women who have multiple orgasms exactly how they do it. Their big secret: They dial back the clitoral stimulation after their first climax.

STUDY: Women Would Rather Date Nice Guys Than Good-Looking Men

Nice guys finish first—even ahead of the good-looking ones, according to new research from the U.K.

Women rated how much they wanted to date certain men after reviewing their photos and stories of how they acted in given scenarios, like when walking by a homeless person. For example, some bachelors pretended to look at their phones but others bought the homeless man a sandwich.

The ladies were more interested in unattractive men who had acted kindly than handsome guys who had acted selfishly.

5 Things Losing Weight Will Never Fix

Think losing weight will make you happier, more confident, and kick-ass at work? Well, it doesn't really work like that...

That's something Kelsey Miller, author of Big Girl: How I Gave Up Dieting And Got A Life, learned the hard way. “I used to tell myself, 'You can do this when you’ve lost X pounds.' That feeling was holding me back in my career and my friendships—it even stopped me from leaving the house," she says.

“The message that weight loss will fix our problems surrounds us,” says clinical psychologist Terese Weinstein Katz, Ph.D., author of the ebook Eat Sanely: Get Off The Diet Roller Coaster For Good. “There’s a fantasy that thin people are ultimately happier.”

While losing weight might make you feel unstoppable at first (and possibly improve your overall health), there are a few issues that dropping pounds definitely won't resolve. So before you set a goal weight, make it your mission to work out the kinks now—not post weight-loss success.

Can Circumcision Mess with a Guy’s Sex Life? Science Explains

Whether you're curious for the sake of your future children, or just want to know more about the differences between cut and uncut peens, most info on whether snip-snips can lead to womp-womps in the bedroom came down to anecdotal evidence. Until now.

According to new research, circumcised men aren’t prone to penis problems in bed (so forget what you've heard).

The study, which appears in The Journal of Urology, studied 62 uncircumcised and circumcised men between the ages of 18 and 37 and found that there was no difference in sexual function between the groups.

10 Foods You Should Eat When You’re Constipated

There’s nothing more frustrating than feeling the urge to poop—then sitting on the john and waiting … and waiting.

Constipation is one of the most common gastrointestinal problems, affecting 42 million people in the United States, according to the National Institute of Diabetes and Digestive and Kidney Diseases.

But loading up on fiber can help keep your gut moving.

“You need fiber in your diet to help push foods through the intestinal tract,” says Sharon Palmer, R.D.N, author of Plant-Powered for Life.

Just remember to drink plenty of water throughout the day to soften your stool so that it can pass through easily, says Gina Sam, M.D., director of the Mount Sinai Gastrointestinal Motility Center.

Here are the 10 best fiber-rich, poop-prompting foods to eat when you’ve been struggling on the toilet.

You Know About the G-Spot, But What About the A-Spot?

There are multiple ways to help your partner have an orgasm. You can stimulate her clitoris or even to work toward the elusive G-spot. But there’s another mysterious erogenous zone that you probably haven’t tapped into yet: the A-spot, or the anterior fornix.

Like the Loch Ness Monster, there’s speculation as to whether the A-spot actually exists. Some experts swear it can trigger long-lasting orgasms, says Yvonne K. Fulbright, Ph.D. and author of The Better Sex Guide to Extraordinary Lovemaking.

Other experts aren't so sure.

“I’ve never seen any proof anatomically of the existence of the spot,” says Mary Jane Minkin, M.D., clinical professor of obstetrics and gynecology at Yale School of Medicine. Though she says that there are some areas of the vagina that are more sensitive than others, she can’t define one exact spot that sets off a long orgasm.

8 Ways to Flirt Without Saying a Single Word

Long before you say hello, you can silently seduce the woman across the bar.

It’s all about tweaking your body language, says Joel Wade, Ph.D., a psychology professor at Bucknell University. Check out the most effective nonverbal pickup cues.

1. Spread Out
Sit at a table with one arm draped over a nearby chair, or lean at the bar with your arms spread apart.

Both moves convey control of personal and physical space, Wade’s research finds. Women interpret this as a sign of dominance—a key trait for boosting your attractiveness, he says.

2. Open Up
Men who don’t cross their arms are seen as more attractive, active, and persuasive, finds a study in Evolution and Human Behavior.