Concerns about Sexual Promiscuity Play an Underexplored Role in Opposition to Abortion

The Hidden Engine Behind the Debate

Imagine human behavior as a giant, complex video game where everyone is trying to build the best life possible. In the world of evolutionary psychology, scientists study how our ancient instincts for survival and reproduction still shape our modern choices. One of the biggest "game mechanics" in this field is our mating strategy. Think of this as your personal rulebook for love and relationships. Some players prefer a "committed" strategy: they want a long-term partner, a stable family, and they invest heavily in one person. Others prefer a "less committed" strategy: they are more open to casual flings, short-term relationships, and having many different partners over a lifetime.

For decades, when people asked why some folks are fiercely against abortion while others support it, the answer seemed simple: it's about religion or politics. If you are religious or conservative, you likely oppose abortion; if you are secular or liberal, you likely support it. It's like saying a car won't start because the battery is dead. But what if the battery is actually fine, and the real problem is a loose wire in the engine? This paper asks a bold question: Are our deep-seated views on abortion actually driven by something else entirely—our hidden fears about how casual sex affects our own life plans? The authors suggest that the "battery" of religion and politics might just be a dashboard light warning us about a deeper, more primal engine: the desire to protect our chosen relationship style from a world of casual sex.

The Secret Link Between Love Styles and Abortion Views

In this study, a team of researchers from UCLA decided to test a new theory. They wanted to see if a person's mating strategy (whether they want a serious, long-term relationship or are open to casual ones) interacts with their deterrence beliefs to shape their views on abortion.

Here is the core idea, explained with a simple metaphor: Imagine a town where people are trying to decide if they should build a wall around the playground.

• The Committed Strategists are parents who have built a beautiful, fenced-in garden for their own kids. They are terrified that if the playground is too open and chaotic, their kids might get hurt, or their neighbors might start running wild and trampling their flowers.
• The Deterrence Belief is the idea that "if we make the playground rules strict (like banning abortion), people will be scared to run wild in the first place." They believe that if there are no easy exits (like legal abortion) for a bad situation, people will think twice before jumping in.

The researchers hypothesized that people with a committed mating strategy (those who want stable, long-term relationships) would be the most opposed to abortion, but only if they also believed that abortion bans act as a "scare tactic" to stop casual sex. They thought these individuals weren't just worried about the fetus; they were worried that easy access to abortion encourages a "free-for-all" sexual environment that threatens their own commitment-based lifestyle.

What the Researchers Found

The team ran four different studies involving over 3,600 people in the United States, including data collected before and after the Supreme Court's Dobbs decision in 2022. They used surveys to measure three things: how committed a person is to long-term relationships, how much they believe abortion bans stop casual sex, and how strongly they oppose abortion.

The results were consistent and surprising. They found that:

1. Committed Strategists Oppose Abortion: People who strongly prefer long-term, committed relationships were indeed more likely to oppose abortion.
2. The "Scare Tactic" Belief is Common: A large majority of people (ranging from about 58% to 79% across the studies) believed that restricting abortion would make people less promiscuous. They thought, "If you can't get an abortion, you'll be more careful."
3. The Magic Combination: The strongest opposition to abortion came from people who had both a committed mating strategy and strong beliefs that abortion bans deter casual sex. It was like finding that the parents with the fenced gardens were the ones most desperate to build the wall, but only if they believed the wall would actually stop the kids from running wild.

Even when the researchers accounted for religion and political conservatism (the usual suspects), this "mating strategy + deterrence belief" combination still held up. In fact, their analysis suggested that religion and conservatism might actually be results of these mating strategies, rather than the root cause. It's as if people choose religious or political groups that align with their desire for a stable, committed lifestyle, and then use those groups to argue for policies that protect that lifestyle.

What This Means (and What It Doesn't)

The authors are careful to say they haven't "solved" the abortion debate, but they have found a new piece of the puzzle. They argue that for many people, the opposition to abortion isn't just a moral stance on the sanctity of life (though that is part of the story). Instead, it might be a strategic move to protect a specific way of living.

Think of it this way: If you are playing a game where you bet everything on one partner, you want the rules of the game to discourage everyone else from playing "casual mode." If the rules allow for easy "reset buttons" (like abortion), you feel your investment is at risk. So, you push for rules that make the game harder for everyone, hoping it forces everyone to play "committed mode."

The study suggests that when people argue about abortion, they might be unconsciously arguing about sexual norms. The authors point out that this explains some weird contradictions, like why some people who oppose abortion make exceptions for rape (where the "choice" to be promiscuous wasn't there) but are strict about consensual sex. It also explains why some anti-abortion groups prefer "abstinence-only" education over "comprehensive" sex education; they aren't just trying to stop abortions, they are trying to stop the behavior that leads to them.

However, the researchers admit there are limits. Their studies were surveys, so they can't prove that one thing causes the other with 100% certainty. They also only looked at people in the U.S., so we don't know if this holds true in other cultures. But the pattern was strong enough across four different groups of people to suggest that the "strategic account" is a real, underexplored force in American politics.

In short, the paper suggests that the fiery debate over abortion might be fueled by a quiet, deep-seated fear: the fear that a world of casual sex is a world where your own commitment to family and love is less safe. By understanding this, we might realize that the arguments we hear on the news are often just the surface-level symptoms of a much deeper, evolutionary game being played in the background.