This daily gesture reveals surprising insights into your sex life: study

A good sex life is in your hands.

A new study on the relationship between sex, love and upper body strength suggests that first impressions – sealed with a handshake – can reveal key details about your personal life.

The study, published in Evolution and Human Behavior, looked at people’s grip strength, a common measure of upper body strength, and survey responses related to sexual behavior.

Researchers at Washington State University analyzed data from 4,316 American adults taken from the 2013-2014 National Health and Nutrition Examination Survey to find out their results.

Stronger men are more likely to be in long-term relationships and have more sexual partners than their peers, the study found.

Meanwhile, stronger women are more likely to have a longer list of sexual partners than their weaker peers. However, strength did not appear to affect the length of women’s past relationships.

Experts have long believed that male strength is an evolutionary marker as males competed against each other for access to mates – survival of the fittest.

Another theory holds that stronger men were more desirable as partners because they could hunt for meat while women cared for children, especially during pregnancy and infancy.

“People have assumptions about men’s sexual behavior and how it relates to evolution,” lead author and anthropologist Caroline Smith said in a statement to Phys.org.

“In addition to acquiring more sexual partners, forming long-term relationships is likely to have also been important for men in evolutionary history.”

However, why women’s strength affects their sex lives remains largely a mystery.

“Men are on average stronger than women, and men report more lifetime partners than women, but men and women are on the same regression line,” said WSU evolutionary anthropologist Ed Hagen.

“Regardless of whether they are male or female, stronger individuals have more sexual partners throughout life. This was a surprising finding and somewhat inconsistent with the sexual selection hypothesis.”

A man’s hands can define more than just their sexual history.

A new app claims to be able to give an accurate prediction of a man’s penis size and shape and your potential sexual compatibility using just a photo of their hand.

Brand strategist Triin Randloo recently released SizeHim, a new tool to give you a hand.

Once users upload a photo of their hand and their potential partner’s hand, the site’s calculations will then predict which of seven penis types – banana/C-shaped UP, flexor, cucumber, shaft big, big head, mushroom or pencil — the person you’re likely to have, odds on your physical sexual compatibility and even gives suggestions on what sex positions would feel best with this sex combination.

The hand can really tell us a lot, Randloo and her curious crew confirmed—when a couple’s size was similar, there was a higher probability of a physical match, which increased the chances of great sex.