Wow. Not a word about the man's number of sexual partners in the marriages that stayed together or divorced. On the other hand, it's apparently very interesting if the woman is a virgin or not when married.
From the article: unfortunately, the NSFG doesn’t have full data on men’s premarital sexual behavior, and in any event they recall their own marital histories less reliably than do women
How was this validated? It seems the groups surveyed during each period were completely different, so they were just asking people if they remembered how many people they'd had sex with. That doesn't seem like methodology that would produce very accurate data, so I'd be skeptical of reading too much into this.
You might expect that people would be able to remember basic things and give consistent answers to questions like whether they've ever used marijuana or had sex or been the victim of a violent crime, but in reality people's answers might as well depend on what they had for breakfast that day.