Correlation is not causation. And among those who do not cohabitate or have any other sexual partners than their husband, is a large proportion of those who will also never get divorced.
If you are of a culture where that is so, very good!
If you are not of a culture where that is so, the correlation isn't really applicable to your situation as it doesn't differentiate.
And you would perhaps be amazed at how many people think statistical analysis is science, especially statisticians!
You would also perhaps be amazed at how many people think that correlation indicates causation, especially statisticians! I mean, really, they don't have much else. When all you have is a hammer, problems look like nails.
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.