Attraction is impossible to understand. Sometimes there's no telling what brings you close to one person over another, or what it was that made you realize you can't stop thinking about them.
No two people are going to agree on what's attractive and what isn't.
Lisa Lawless, a clinical psychotherapist and sex educator, told Insider attraction is multifaceted and "includes visual cues, scent, hormones, genetics, and evolutionary factors."
"It's crucial to acknowledge that physical appearance constitutes merely one aspect of a person and doesn't define their essence or worth as a human being nor define how attractive they are to others," she said.
Jacqueline Fae, a dating coach and the founder of IDL Match Club, told Insider all five senses factor into a couple's compatibility too. "You need all of them to have like the ultimate attraction," she said.
Here are some of the ways people are biologically drawn to each other.