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Semenya competes at the international level for South Africa.

Olympic runner Caster Semenya will be allowed to compete, after rules that banned her from races due to high testosterone were suspended

Caster Semenya's body produces more testosterone than average. The International Association of Athletics Federations said she had to reduce it.
Caster Semenya.

Forcing women like Caster Semenya to medicate to compete in sport is being called a ‘dangerous precedent’ — here’s why

The LGBT charity Stonewall is among those arguing that women's sport has taken a step back with the ruling on Caster Semenya's case.
Male birth control has typically been available in just one form: condoms. Those are about 85% effective at preventing pregnancy.

A new birth-control gel that men rub on their shoulders once a day is being tested in the US

Men rub the birth-control gel on their shoulders once a day, then wear a shirt during sex or shower beforehand because women shouldn't touch the goo.

A new form of male birth control is being tested around the world — and men only have to rub it on their shoulders once a day

Scientists are moving forward with a year-long trial of male birth control gel. Men rub a nickel-sized amount of the alcohol-based gel on themselves. The drug works by suppressing a man's sperm levels, and usually takes about eight to 12 weeks to become fully effective.

Olympians may be taking cues from Silicon Valley’s favorite way to do drugs

Testosterone microdoses may escape regulators’ radar because they only stay in the system for the duration of an event.

A new study finds stressed-out men are less likely to be high-status leaders

The findings may help explain your lack of advancement.