A couple has been dating for two weeks. They experience an intense, almost obsessive, desire to be together and are highly physically attracted to one another. However, they have not shared many personal vulnerabilities and have not made any plans for the relationship beyond the immediate future. Which component of a loving relationship is most strongly demonstrated by this couple's experience?

A couple in the early stages of their relationship experiences an intense, overwhelming physical attraction to one another. They feel a strong desire to be physically close and are often preoccupied with thoughts of each other. This aspect of their connection primarily represents which of the following concepts in the context of romantic relationships?