I think you have it backwards, the pill has proven to be useless in female hands, but make one for men, and illegitimacy will instantly disappear.
Females will want to regain sexual control, so they will deal with the only tool left to them, get a ring before giving up sex.
I understand your point, but I do believe that what I stated would be the prevailing view among women and girls. Besides which, there’s a too high % of men who do enjoy getting women pregnant as a sign of potentcy.