science

What? No? The way I understand the comment at least, it's suggesting that males are more socially solitary. There's plenty of evidence suggesting that women, from a biological perspective, are more heavily tuned towards socialising (e.g. are more adept at giving and recognising subtle social cues, and maintaining larger social networks).

If that is the case, it makes sense that the men, who likely maintained smaller social networks within whatever group (family, tribe, etc.) they came from, would leave that group and integrate with the women group, rather than opposite.