Check out this series of charts. Each method of contraception in its own chart, and "perfect use" and "typical use" are both plotted. Out of 100 couples using

Check out this series of charts. Each method of contraception in its own chart, and "perfect use" and "typical use" are both plotted. Out of 100 couples using a condom as birth control, 55 will have an unplanned pregnancy in 4 years with typical usage (8 out of 100 with perfect usage). http://www.nytimes.com/interactive/2014/09/14/sunday-review/unplanned-pregnancies.html?_r=0 http://www.nytimes.com/interactive/2014/09/14/sunday-review/...