Item — HN Reader

Sounds like interesting option, but 98% efficiency seem pretty unreliable, so I will still be at risk 2 times out of 100 intercourses when not counting other factors.

Personally I consider immediately after having second child vasectomy, though if wife would agree I would do it already now (one child is more than enough for me) plus store sperm in bank just in case if changing mind, since I heard reversing vasectomy ain't that successful. Seem safer with 0.15-1% failure rate than this method.

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> Sounds like interesting option, but 98% efficiency seem pretty unreliable, so I will still be at risk 2 times out of 100 intercourses when not counting other factors.

Efficacy for contraceptives is almost always measured per year. That is, of every 100 couples using this method for a year, two will become pregnant. As the article says, this is about the same level as (perfect use of) condoms.

seem very inaccurate since every couple has very different frequency of sex per year, some couple can have 100 intercourses, other will have 20 and they have same odds according some average couple?

The inaccuracy would depend on the sample size of the test groups. It might be useful to get standard deviation, or maybe the methodology excludes outliers?

The % efficiency figures for contraceptives are for one year of typical use, not per go.