Chemistry "Frequencies" .
Chemistry. That undefinable, complex combination of traits and characteristics about another person that causes an undeniably powerful magnetic attraction. Countless authors have tried (unsuccessfully, most would say) to define it. Some have tried to make it "create-able." (Apparently, that can't be done either.)
Well, even if we can't DEFINE it, we can describe it, we'd propose, for the sake of clarity ...
We humans are like FM radio stations ... each one of us is on a different FREQUENCY. (None right or wrong, by the way. Just different.) And when we're across the table from someone on a DIFFERENT frequency, there's not going to be the attraction, the spark, the "magic" of romantic possibility. Oh, to be sure, we can be great friends, brother and sister in Christ, but the "magic" won't be there.
If I'm "a 99.7" and the other person is "a 103.5" we're just not going to want to pursue the possibility of a relationship.