Given the character of the modern world, it seems sensible to re-evaluate some of our assumptions. For instance, the importance of sexual abstinence. Arguably, it derives from three considerations: the danger of pregnancy, the risk of disease, and the social concept of sin. In modern society, good tools are available for dealing with all of these. Among them, hormonal birth control systems, condoms, and atheism. Arguably, much of the case for sexual abstinence has vanished.
Contrast that with the (barely existent) public case for reproductive abstinence. Given that society is grossly unsustainable, we don’t even have evidence that the number of people currently alive can continue to live at the level of material welfare they do. Despite this, most governments push fertility. There is parental leave, there are often tax breaks for marriage and having children, and house ownership is encouraged through public subsidy.
Perhaps the world would be a better place if governments became significantly more lax in their efforts to discourage sexual abstinence, while simultaneously shifting towards encouraging reproductive abstinence. Given the degree to which our gross over-use of the natural resources and adaptive capacities of the planet is threatening the future of the human species, it seems quite rational, in the end. Obviously, governments with some respect for personal liberty cannot actually curtail reproduction. Of course, they couldn’t curtail sex either. The idea is to shift from efforts in the latter area to efforts in the former one. That need not involve anything too restrictive: just making sure that those who don’t want children have the tools required to avoid it, while reducing the degree to which society at large helps finance the reproduction of those who choose to undertake it.