Female birth control is much more efficient. One male birth control and 100 females not under birth control has 100 more pregnancy risk than 100 males and one female not under birth control.
It's nice to have the option to do both. Hormonal contraceptives aren't 100% reliable. Having a bout of diarrhea can render them ineffective. It's easy to miss a pill.
Obviously the comparison is not symmetrical. So it‘s nonsense. Maybe a „not“ was added accidentally.
In any case, it‘s also factually wrong. The majority of men do not have sex with a very large number of women. And those who do would be well advised to use a condom to prevent STDs.
In fact the opposite is the case: Since the number of men who have sex with a very large number of women is known to be small, the few men taking the pill could replace a large number of women having to take it, therefore the pill for men would be more efficient.
That logic doesn't make any sense unless you assume there are 100 men to every woman on earth, or alternatively, that women have 100 times more sexual partners than men. Evidence suggests otherwise.
Or put another way: you're comparing one group where 1/200 is on birth control to another group where 99/200 is on birth control. Obviously the group that has almost 100 times more people on birth control is more "efficient". That has nothing to do with sex.
But to address the issue of efficiency, I would expect male birth control is more "efficient", as women can only carry a few children at a time while men can theoretically impregnate dozens or even hundreds of women in the same period.
But I find the quibbling over efficiency to be missing the point. Male contraception offers peace of mind to some. It has nothing to do with efficiency.
> That logic doesn't make any sense unless you assume there are 100 men to every woman on earth, or alternatively, that women have 100 times more sexual partners than men. Evidence suggests otherwise.
Even if men and women have the same number of sexual partners female birth control will be more efficient if that number is more than one.
Consider a hypothetical group of 1000 men and 1000 women that consists of 500 monogamous couples, using no birth control and frequently having sex. If you randomly pick half the men and give them male birth control or randomly pick half the women and give them female birth control then you'll but the number of births approximately in half.
For that group then male and female birth control are equally efficient.
Consider a similar group, 1000 men and 1000 women, but without monogamous couples. Each person has a dozen partners they regularly have sex with. In that group giving 500 women birth control will cut the number of births in half. Giving 500 men birth control will lower the number of births some but not much.
For that group female birth control is more efficient.
