Sexual polarity is how the differences between men and women create attraction between them.
Relation to shit testing
[deleted] notes, "shit-testing is the foundation of creating strong sexual polarity. If you define 'more compatible' as someone who doesn't ever test you, then sure you can easily find that. But in those relationships there will be no spark, no chemistry, no polarity - just roommates who have passionless duty sex once a month. But if you define 'compatible' as strong sexual polarity, as a woman who enables her man to reach the peaks of his masculine polarity, and a man who enables his woman to reach the peaks of her feminine polarity, then shit-testing is inevitable. And it's something we as men need to not only tolerate, but also appreciate."