Sex

A male lemur with clearly visible scent glands on its wrists.

For Male Lemurs, Love Stinks—and Scientists Now Know Why

A newly identified trio of chemicals may help the primates find a mate

Archaeologist Kate Kolwicz examines fragments of late 19th-century Chinese pottery unearthed in downtown Missoula.

Remnants of a 19th-Century Red-Light District and Chinatown Unearthed in Montana

A trove of artifacts reveals the town of Missoula's remarkable and diverse past

John Addington Symonds, whose 1873 essay "A Problem in Greek Ethics" helped lay the foundation for the modern gay rights movement

Researchers Recover an Early Copy of a 19th-Century Gay Rights Essay

This once-lost copy of "A Problem in Greek Ethics" is only the sixth of its kind

Sandro Botticelli's "Birth of Venus" finds its subject striking a contrapposto pose

Why Viewers Are Drawn to Renaissance Artists' Go-To Pose

A new study finds that the contrapposto stance reduces the waist-to-hip ratio, an attribute popularly associated with attractiveness

Female (left) and male (right) black widow spiders

Male Black Widow Spiders Find Potential Mates by Following Other Suitors’ Trails

Although this strategy may seem counterintuitive, researchers say speedy tracking is an important factor in successful courtship

After a queen ant successfully mates with multiple males, she chews off her wings, returns to the ground and starts a new colony

Swarms of Flying Ants Overtaking Great Britain Show Up as Rain on Radar

Once a year, the winged insects take to the skies and engage in mating rituals

A digitally-colorized scanning electron micrograph depiction of a Giardia lamblia protozoan caught in a late stage of cell division, producing a heart-shaped form. Most protozoa, or singled-celled eukaryotes, reproduce asexually, but there is evidence to suggest Giardia lamblia can reproduce sexually as well.

The Evolution of Sex Could Have Provided a Defense Against Cancer Cells

The first sexually reproducing organisms may have found that the energy-intensive enterprise bolstered defenses against malignant cells

Bonobo Mothers Interfere in Their Sons' Monkey Business

They find suitable mates for their offspring and chase away intruders once the mating begins, boosting fertility rates

Carolee Schneemann, "Eye Body #11," 1963

Carolee Schneemann Pioneered the Way Women's Bodies Were Seen

The multidisciplinary artist, who died this month at 79, used her body as a canvas to produce works that celebrated female sexuality

While testosterone plays a significant role in fetal development, it is not the only hormone that influences masculinization.

In Addition to Testosterone, Another Hormone Is Vital for Early Male Development

A hormone called androsterone, produced in the placenta and other organs, plays a role in fetal development in the womb

Interior of the British Library in London

The British Library’s Dirtiest Books Have Been Digitized

The collection includes around 2,500 volumes and many, many double entendres

A City Frog's Love Song Attracts More Mates Than Countryside Croaks

Fewer predators and heightened competition for mates allowed urban tungara frogs to add more notes and frills to their calls, with big results Read more: h

Ganymedes and the heron.

Recently Unearthed Roman Latrine Was Full of Dirty Jokes

Mosaics uncovered in a Roman bathroom in modern-day Turkey reminds us that bathroom humor has ancient roots

Ants and honey bees have been observed reproducing without males before, and now all-female termite colonies join the asexual group.

All-Female Termite Colonies Reproduce Without Male Input

These insects seem to have dispensed entirely of the need for males and their sperm

This pipefish couple may seem the picture of romance, but the male may have something bigger and better in mind.

Pregnant Male Pipefish Are the Sea's Swaggery Swingers

Male pipefish, which take on the burden of carrying eggs to term, can compromise their own pregnancies if they see a “huge, sexy female” swimming by

Sometimes, it's okay to skip leg day.

For Men, Gains in the Gym May Come at a Cost to Sperm

There might be a tradeoff between how strong men look and sperm count

Aggressive or sexual behavior in crows interacting with dead bodies might happen more often when sex hormones run rampant.

It's Not Without Caws That Crows Desecrate Their Dead

What dead crows can teach us about the connections between sex and aggression

This scrotal male certainly isn't sheepish.

The Earliest Mammals Kept Their Cool With Descended Testicles

But if free-swinging sperm sacs are the norm, then why did undescended ones evolve four separate times?

Anemonefish, also known as clownfish, are born androgynous and can shift from male to female in one lifetime.

Alternatives to Heterosexual Pairings, Brought to You By Non-Human Animals

No one quite has this sex thing figured out, but these non-binary animals have some good ideas

Don't judge a bat by its cover ... of Barry White.

Like Birds, Some Bats Warble to Woo Their Mates

They join an elite club of mammals—including mice, whales and humans—whose melodies convey complex information

Page 4 of 9