Welcome aboard, curious77, and thank you for an interesting question.
Please read about the major aspects used to calculate the presence and strength of each quality in the
about us section.
The calculation of intimacy and passion are independent of each other, but if I was forced to point out some correlation between the two, it would have been a negated (reversed) correlation.
Intimacy between two people often calls for similarity in characteristics and background since these are major contributors to one's ability to understand the other's position and sympathize with it. On the other hand, passion is often triggered by the natural attraction that we have to the foreign, unknown and mystical properties of someone who's very different from us.
I hope that this answer satisfies your question.