Sex

How many partners you’ve had matters – but so does when you had them. A global study reveals people judge long-term partners more kindly if their sexual pace has slowed, challenging the idea of a universal sexual double standard.

Forget flowers and chocolate – in the spider world, courtship survival is the ultimate gift. Scientists have discovered a new genus of tarantula and its defining feature is a supersized sperm-delivery arm nearly four times the length of their body plate.

What if your music could move you in ways it never has before? That's what Groove Thing promises to accomplish with 'the world's first internal music player,' where its vibrator "transmits music sound waves as rich, nuanced physical sensations."

A surprising finding from researchers in Japan has shown how an environmental factor can influence the development of sex organs in unborn mice. The discovery challenges the longstanding belief that sex is determined purely by genetic factors.

A fascinating new look into the private lives of apes has found that chimps settle conflict with friends with genital contact, much like their bonobo cousins. This sheds light on where our own sexual behavior originates, some six million years ago.

A study estimating the number of under-50s worldwide who are living with genital herpes has highlighted changing sexual behaviors and the need for many countries to consider more effective ways of curbing the transmission of this incurable disease.

Upending long-held beliefs that testosterone levels fuel sexual desire, a new study has found that while the hormone plays a key role in reproductive success, elevated concentrations may instead drive 'courtship' efforts – particularly in single men.

New research has found that men’s and women’s metabolisms favor eating different foods at breakfast time and could be key to developing personalized nutrition strategies that help to address health issues or lose weight.

Lab-grown testicle organoids that closely resemble the real thing provide a promising model for research that may help our understanding of testicular development and translate into therapeutic applications for male infertility.

Scientists have uncovered how the brain's far-reaching Behavioral Activation System, along with chemical drivers, can override other cognitive processes when we experience romantic love, driving that all-consuming focus on the object of our affection.

Almost 25 years since scientists first identified a difference in anesthetic sensitivity in males and females, a new study reveals how sex hormones make men more responsive to going and staying under. Yet dosage is still decided on by a patient's size.

Male serotine bats living in a Dutch church attic have been captured on camera engaging in marathon sessions of non-penetrative sex, while armed with a heart-shaped penis that's seven times longer than the female's vagina. Yes, this is a true story.