别吵了 查查wikipedia不就知道了: http://en.wikipedia.org/wiki/Comparison_of_birth_control_methods
the chance of pregnancy during the first year of use：
typical use: condom 15%, the pill 8%
perfect use: condom 2%, the pill 0.3%
the chance of pregnancy during the first year of use：
typical use: condom 15%, the pill 8%
perfect use: condom 2%, the pill 0.3%
[此贴子已经被作者于2012/10/2 10:06:06编辑过]