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Just to calrify - success rates for contraceptive methods are generally measured of 100 couples using that method for ONE YEAR.
The number that they use is (from memory) around 85 copulations per couple per year - so a 4% success rate for withdrawal used perfectly, ammounts to 4 of 100 coupes using it for a year conceiving.
the 30 to 40% is on the same basis for unprotected sex, as is the 2% for condoms used perfectly (same for hormones too).
What this means is that if 100 couples have sex 85 times each in a year, 4 will get pregnant - so that's 4 pregancies out of 8500 copulations - so the 4% statistic comes out as more like 0.048% per session of intercourse.
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Overhead, the Albatross hangs motionless upon the air,
And deep beneath the rolling waves,
In labyrinths of Coral Caves,
The Echo of a distant time
Comes willowing across the sand;
And everthing is Green and Submarine
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