This is pretty much how my relationship with my SO started. I just came out of a bad relationship where I was cheated on and met her, and told her in no uncertain terms I was looking for nsa fun and nothing else.
That was in 2008. Never married but still (happily) together with a 13yo son.
Me and my most recent partner also started similarly. Both had harsh breakups about at the same time, got into a FWB relationship, on date 4 I think we were both like "this is clearly not a FWB relationship". We talked over what we wanted to do and both decided being partner-partners sounded good. Shortly after they invited me to join them out of country for a week and I was like fuck it, this will either go very well or very poorly. It went very well. Now my damaged self is trying to figure out when or if I should tell them how much I'm falling for them