Of course this works, but most people who want to prepare their teenagers for the consequences of a sex life will push for condoms and possibly additional birth

Of course this works, but most people who want to prepare their teenagers for the consequences of a sex life will push for condoms and possibly additional birth control. Pregnancy is just one consequence, obviously. Culturally, a lot of people still would rather use tactics intended (with whatever level of efficacy) to prevent teenagers from being sexually active altogether.