In the hunt for a male contraceptive, scientists look to stop sperm in their tracks

Condoms have been used to prevent pregnancy since the Middle Ages, with the rubber version arriving in the industrial mid-1800s. Over the years, they've become more effective and comfortable to use.

But it was the invention of birth control pills, followed by IUDs in the 1960s, that created a seismic shift in humans' ability to control reproduction. A growing range of pills, patches and implants became available to women. And yet, a stretchy sheath that covers the penis remains the only medically approved form of contraception for men, short of vasectomy.

But now, researchers are looking into both hormonal and non-hormonal contraceptives for sperm bearers. The hope is that couples will begin to treat contraception more as a shared responsibility.

"We would like to create a menu of options for men similar to what women have available to them," says Stephanie Page, a researcher and