Bugger! I wish you had told me that earlier.
I went out with a girl and we had fish and chips sitting in my car at the beach.
We talked about moving in together and how it would work etc.
Do you think we were rushing things?
I only ask because nine weeks later we moved in together.
Shortly after that we got married.
It's been four years and we're still married. :-)

I get where you're coming from, and I agree with what you're saying.
But when it is right, it is right. When you feel that, dive in head first and don't regret a second of it. Life is about risk, the bigger the risk the bigger the reward.
I think it also makes a big difference that I was in my 40s when I met my wife. So I had a bunch of life experience already. If you're looking to hook up for life in your 20s then that's rushing it.