Has anyone been in a “FreeUse” relationship? If so how did it work out for you? Or are “FreeUse” relationships just a rumor?

If this is a real deal I am really curious about how that works. Please explain in as much detail as you are comfortable with.
Has anyone been in a “FreeUse” relationship? If so how did it work out for you? Or are “FreeUse” relationships just a rumor?
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