Oh....PRIOR to marraige....that makes sense
I think people, especially women, who have fewer partners prior to marriage are usually religious.
It has been shown that people who attend church regularly have happier marriages and far fewer divorces.
I think what the study is really measuring is the spirituality of those in happy marriages.
“Study: People With Fewer Sex Partners Report Happier Marriages”
Zero and you should be happy as a clam, right?