In my benevolent-dictator utopia, a totally safe, dosage-unimportant, man and child safe, otherwise perfect birth control is in the water supply and fortified into basic foods. To be fertile, you have to take the antidote for a month or two.
The antidote is widely available over-the-counter for about a dollar per hundred pills. No questions asked, no licensing, no counseling, no credit check, no home visit, it's easier to get than Tylenol. But to get pregnant you have to actively, deliberately take the antidote and you have to stick to it for a little while.
I think this would improve the world tremendously.