At 30 years old, Chloe is interested in building a romantic relationship. However, she often finds herself focusing on a specific detail when getting to know a man: the number of previous partners he has had. "I get stuck on how many partners the men I meet have had," she admits. While a few past relationships don't necessarily concern her, a high number can change how she views the person. This concern often brings up questions about loyalty, commitment, or the ability to be in a lasting relationship. Chloe is not alone in this reaction. A large study involving 5,331 participants from 11 countries explored how a person's sexual history affects our perception of them as a potential partner. Published in Scientific Reports, the study found that as the number of former partners increases, participants are less likely to consider entering a serious relationship with that person. However, the research also shows that the number alone doesn't tell the whole story. Why can a high number of past partners become a barrier in forming a relationship? To test this, researchers presented participants with different sexual histories. Potential partners were described as having had 4, 12, or 36 previous partners. The results were clear: as the number increased, the desire to consider a long-term relationship decreased. The drop between 4 and 12 partners was especially noticeable. However, this does not mean that someone with many past partners is less faithful or less capable of love. The study measured perceptions, not future behavior. When someone learns about another's sexual history, they can interpret the number in various ways. A high number might suggest a preference for short-term relationships, a different attitude toward sex, or a reduced desire for stability. In this way, the number becomes a mental shortcut, influencing how we judge someone not just by what we know about them now, but by what we imagine their behavior to be based on their past. What matters is not only the number of past partners, but what that number signifies in the present. One of the most interesting findings from the research is that scientists didn't just vary the number of partners; they also changed how frequently the partners appeared over time. At an equal number of past partners, a person whose recent sexual encounters had become less frequent was viewed more positively than someone whose encounters had increased recently. This effect was especially noticeable among those with 12 or 36 past partners. Our perception seems to include the idea that behavior can change over time. For someone like Chloe, who feels stopped by this type of information, this nuance can help shift the focus of the question. Instead of asking only "how many?" it might be more useful to consider what this story means today. Has this person previously sought casual relationships and now wants something more committed? How do they talk about fidelity or relationships? How do their actions align with what they want to build? The researchers also found that people who are more open to casual sex place less importance on the number of past partners, which reminds us that our reactions also depend on our own values. A sexual history can remain an important factor if two people have very different views on sex or commitment. However, the number alone does not necessarily summarize someone. Between the person they were ten years ago and the person they are sitting in front of us today, there can be an entire story.