If you observe, the majority of guys who end up marrying the retiring sluts, it's usually the STEM bros (tech bros, engineers, doctors)
Because majority of them are just nerds, while academically gifted, they tend to lack on their social skills
So in their school days till graduation they're basically invisible to women. It's only after they start making money from their high paying careers that they become visible to women
The women start flocking to these brothers. Unbeknown to these brothers, they genuinely believe these women are attracted to them, when in reality it's the lifestyle
The women know these are men with not much experience, so they aren't that hard to manipulate. In the blink of an eye, the brother marries the retired slut
End of story (or is it)