like a definition and whats expected if youre in an open, serious, complicated etc. relationship??

any one care to explain

there are some threads in here dedicated to just that im sure. maybe it's the one that is stickied.

open- i think it's basically the same as friends with benefits but you're still an "item" even though it's ok to screw other people.

serious - opposite of open and probably engaged?

complicated - might be fwb and open-like

thanks