Great paper "Couple Similarity on Personality, Moral Identity and Spirituality Predict Life Satisfaction of Spouses and Their Offspring"

https://link.springer.com/article/10.1007/s10902-019-00108-8

Although the researchers used the obsolete Big Five model to measure personality of participants, it is a must read for the Online Dating Industry!

Please see also:
PAPER: Aspirational pursuit of mates in online dating markets
https://onlinedatingsoundbarrier.blogspot.com/2018/08/paper-aspirational-pursuit-of-mates-in.html

A Cultural Algorithm for Determining Similarity Values Between Users in Recommender Systems
https://onlinedatingsoundbarrier.blogspot.com/2019/04/a-cultural-algorithm-for-determining.html

The Online Dating Industry needs INNOVATIONS, not more bells and whistles.
http://onlinedatingsoundbarrier.blogspot.com.ar/2018/01/mistakes-at-behavioral-economics-of.html

Breaking "the online dating sound barrier" is to achieve at least:
3 most compatible persons in a 100,000 persons database.
12 most compatible persons in a 1,000,000 persons database.
48 most compatible persons in a 10,000,000 persons database.
100 times better than Compatibility Matching Algorithms used by actual online dating sites!

High precision in matching algorithms is precisely the key to open the door and leave the infancy of compatibility testing.
 
Without offering the NORMATIVE 16PF6 (or similar test measuring exactly the 16 personality factors) for serious dating, it will be impossible to innovate and revolutionize the Online Dating Industry.

The 3 milestone discoveries of the 2001 - 2010 decade for Theories of Romantic Relationships Development are:

I) Several studies showing contraceptive pills users make different mate choices, on average, compared to non-users.
"Only short-term but not long-term partner preferences tend to vary with the menstrual cycle"

II) People often report partner preferences that are not compatible with their choices in real life. (Behavioural recommender systems or other system that learns your preferences are useless)

III) What is important in attracting people to one another may not be important in making couples happy. The key to long-lasting romance: COMPATIBILITY is exactly STRICT PERSONALITY SIMILARITY and not "meet other people with similar interests or political views".  

PAPER "Only the congruent survive - Personality similarities in couples. Personality and Individual Differences"
http://onlinedatingsoundbarrier.blogspot.com.ar/2013/04/paper-partnership-longevity-and.html 
PAPER "Partnership longevity and personality congruence in couples"
http://onlinedatingsoundbarrier.blogspot.com.ar/2010/04/only-congruent-survive-personality.html
 
At the paper  "Perceptions of Ideal and Former Partners' Personality and Similarity" 
The authors had written
".... mismatches in personality are a frequently mentioned cause for relationship break-up. If former partners indeed have dissimilar personalities, our findings underline how difficult it is for many people to select a mate with a similar personality, or, alternatively, how little value individuals put on finding a similar partner in terms of personality.
The present study's results, as well as the results found in previous studies (e.g., Eastwick & Finkel, 2008), may be used to educate people, especially singles, about what really matters in long-term relationships, for instance, similarity in personality, instead of complementarity."
http://onlinedatingsoundbarrier.blogspot.com.ar/2011/05/big-punch-to-behavioural-recommender.html
http://onlinedatingsoundbarrier.blogspot.com.ar/2012/07/two-papers-debunking-behavioural.html

Online Dating sites have very big databases, in the range of 20,000,000 (twenty million) profiles, so the Big Five model or the HEXACO model are not enough for predictive purposes. That is why I suggest the 16PF6 test instead and another method to calculate similarity.

High precision in matching algorithms is precisely the key to open the door and leave the infancy of compatibility testing.
Without offering the NORMATIVE 16PF6 (or similar test measuring exactly the 16 personality factors) for serious dating, it will be impossible to innovate and revolutionize the Online Dating Industry.
 
The 8 tips to innovate in the Online Dating Industry!
http://onlinedatingsoundbarrier.blogspot.com.ar/2013/12/the-8-tips-to-innovate-in-online-dating.html