Sex is an important aspect of a romantic relationship, but it is not the sole factor that determines whether or not a couple stays together.
A lasting relationship is built on trust, communication, mutual respect, and shared values and goals. While sexual chemistry is important, it is not the only thing that keeps a couple together.
Other factors such as emotional intimacy, shared experiences, and a deep understanding of one another also play a vital role. Additionally, a relationship is about much more than just physical attraction; it's about building a deep emotional bond with someone.
Sex can certainly be a part of that bond, but it is not the only thing that makes a relationship last. Ultimately, what keeps a couple together is the effort and commitment they put into the relationship.
Sexual intercourse only allows lovers to get to know each other better but it cannot keep the relationship.