While male contraception has been studied before, no method met the stringent safety and effectiveness criteria that female methods do. It was also unclear whether men would use them.

关于男性避孕术已经早有研究，但还没发现一种比女性避孕术更安全有效的方法。而且，尚不能确定男性是否愿意使用这些方法。

youdao

You are unlikely to find the Pope Tweeting radical doctrinal changes about the need for female priests, or about contraception.

FORBES: If The Pope Can't Get His Favorite Twitter Handle, Who Can?

Until now, the female pill has been the most effect form of contraception.

BBC: '100% success' for male pill trial

However, some socially conservative polices opposing abortion and health care coverage for contraception appear to be raising concerns among female voters.

CNN: Romney condemns Obama's 'assault on our economic freedom'