If you want to improve your chances, there are implants and the buddy system, as well as good ol' abstinence. At some point, though, we're going to have to get over the idea that "responsible" sex has as much to do with numbers as it does behavior -- as well as the idea that the actions of "irresponsible" people justify stripping the rights of "responsible" people.
This ties into another popular anti-abortion talking point, that having an abortion means that someone doesn't care about children and/or the sanctity of human life. But in the U.S., 60% of abortions are sought by people who already have children. Many are sought by people who describe themselves as religious. One study found that out of 670 women surveyed, 53% described the decision to have an abortion as "very or somewhat difficult."
It's not just America, either. Despite an increase in the number of countries to legalize abortion in the last two decades, the worldwide abortion rate has dropped. This is something you wouldn't expect if we were treating safe, legal access to abortion as an invitation to participate in The Purge: Kidz.