Right, correlation is not causation. There could be a causal factor that causes both the sluttiness and the tendency for divorce.
However, there’s the correlation. So if you’re looking for marriage material, it might be wise to stay away from sluts, since increasing sluttiness seems to correlate to increasing risk of divorce.
Not being of such a culture or religion, your options are limited, as they usually do not “allow” (yes parental permission is often a factor among such cultures) their daughters to marry outsiders.
Come back when you find a study that compares people of the same level of religious devotion and culture, and their rates of promiscuity and cohabitation and how they correlate to divorce and you MAY have a leg to stand on.
As it is correlation is not causation. Amusing that you agree to that principle, and then immediately ignore it.
If you are from a culture where promiscuity and cohabitation are acceptable, you will be more likely to get divorced if you marry that people from a culture where promiscuity and cohabitation are not acceptable.
Among those who are from a more sexualized culture and do NOT engage in promiscuity or cohabitation - are their rates of divorce actually lower - The study as designed has no way of showing that.