Sex

Fertility apps promise to help women both get pregnant and avoid pregnancy. But how reliable are they?

What’s Actually New About Today’s Newfangled Birth Control Apps?

These futuristic-sounding apps are on the rise, but it’s key to separate the data from the hype

Paul Ehrlich was the first to take a chemical approach to immunity.

The First Syphilis Cure Was the First 'Magic Bullet'

The term 'magic bullet' once just meant a targeted drug

Male wolf spiders may have eight eyes, but they still can't tell whether the female they're mating with is dead or alive.

Whoa: Polygamous Wolf Spiders Have a Natural Form of Birth Control

Females have figured out how to get rid of unwanted sperm, allowing them to reap the benefits of multiple mates

This is cowpea seed beetle penis, not a weapon from Game of Thrones

Why Seed Beetles Are Caught in a "Sexual Arms Race"

The strange spiky penis of the cowpea beetle seems to drive the evolution of both male and female beetles

This App Could Bring Sex Ed To All Students

Real Talk helps middle schoolers access reliable sex ed information using storytelling, regardless of whether they have internet at home

Ovarian cells did their thing in a dish for researchers who used microfluidics and chips to recreate a female menstrual cycle.

Your Monthly Menstrual Cycle, Reenacted on a Microchip

Bodies are complicated, but they’re no match for persistent bioengineers

In times of desperation, female sawtooth sharks have been known to reproduce sans males. For other species, solo reproduction is downright vanilla.

Meet Eight Species That Are Bending the Rules of Reproduction

Spice up your mating life with relationship tips from rock lizards, sharks and water fleas

Fascinating: How Transparent Glass Frogs Mate

First, the female collects water from a leaf in order to hydrate the eggs inside her. then releases them for the male to fertilize

These are actually tadpoles.

Now You Can Measure Male Fertility With a Smartphone App

A new device helps men monitor their sperm count from the comfort of their own home

The ancient damselfly's courtship ritual was caught in amber 100 million years ago.

Flirtatious 100-Million-Year-Old Damselflies Found Frozen in Amber

Scientists are learning about how insects evolved from their ancient come-hither dance

From the same DNA, different genders can boast dramatically different characteristics. Dung beetles are helping scientists understand how.

What Dung Beetles Can Teach Us About Sexual Difference

When it comes to sex appeal, it's not all in your genes (it's also in your proteins!)

Ecologists tend to think of mobbing behavior as primarily a way that smaller birds protect their nests and chicks from larger predators. Shown here, a Willie wagtail attacking an Australian raven.

Why Do Male Birds Take on Larger Predators? Maybe Just to Impress the Ladies

Some mobbing behavior may be less about survival, and more about sexual selection

Still Life with Fruit, Oysters, and Wine by Everhart Kuhn, ca. 1865

Are Oysters an Aphrodisiac?

Sure, if you think so

When it comes to reversible ways to prevent pregnancy, men have limited options—for now.

Contraceptive Gel Called the “IUD For Men” Makes It Through Monkey Trials

Vasalgel aims to make contraception for men as easy and effective as IUDs have for women

Victorian mores influenced ideas not just about men and women but animals too.

How Victorian Gender Norms Shaped the Way We Think About Animal Sex

No, females aren't always choosy and males don't always get around

Smallmouth salamanders reproduce sexually, which may give them certain advantages.

When Is Sex Worth Going the Distance? When You’re a Salamander, Apparently

Asexual amphibians may be less equipped to handle modern threats than their sexual counterparts

After a 2011 version of this statue was installed outside the Japanese embassy in Seoul, they began to pop up around the world.

"Comfort Woman" Statue Stokes Old Tensions Between Japan and South Korea

She’s a silent reminder of the plight of hundreds of thousands of women forced into sexual slavery by Japan during World War II

Hair removal is personal—but it may be time to bring science to the party.

Bare Down There? New Study Suggests You’re More Susceptible to STIs

Your pubic preferences could be linked to your sexual health

Showy traits, like the large antlers of these bull moose, can be detrimental to an animal's health.

Go Big or Go Generic: How Sexual Selection Is Like Advertising

When it comes to attracting mates, it pays to either go all out—or not try at all

Conforming to masculine norms can leave men isolated and unable to cope with the stresses of life.

Sexism Sucks for Everybody, Science Confirms

Adhering to masculine norms can be toxic for men, not to mention everybody else

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