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What is the optimal length that a couple should date before moving in?
(lemmy.perthchat.org)
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It can hardly be called a “well-known fact.” There are many conflicting studies on this matter, even coming from the same research organizations. For example, this snippet from an article in The Atlantic:
Here is that study.
perhaps i need to revisit the subject in detail, but a posted above a more recent study from 2019 which looks at the same subject.
like i said in a comment above, i'm happy to be proven wrong about this, i was just reporting what i knew about it from academic experience.