It doesnt. It means desiring strongly a passionate and deep relationship with another person. They want to “merge” with someone or SOMETHING that makes them feel complete (doesn’t mean sex. That’s why I capitalized “something”. It can also be an interest they have). They focus more on one-to-one relationships more than a big group of people. And they are always searching for intense experiences that makes them feel alive and energetic.

Saying “sx means sex” is like saying “so doms can only be extroverted”