Researchers found that the island's sex ratio became increasingly male-biased after several years of uneven breeding.

The doctor explained how a sex hormone imbalance can affect mood and fertility.

She told her friend that she didn't want to be anyone's sex partner without an emotional connection.

Researchers measured how sex hormones fluctuate during different stages of development.

They talked honestly about boundaries and consent, and agreed to wait on bum sex until they both felt ready.

She regretted agreeing to insta-sex with someone she met at the bar.

The male fly used its sex comb to grasp the female before mating.

The researcher carefully photographed the fruit flies' sex combs to analyze variations across populations.

The research team examined how same-sexness influences family dynamics in multicultural societies.

The activists organized a sex boycott to pressure the government.