If we are single, we can date who we want, when we want. We have that autonomy.
Correct, but I chose not to be single. That's not the same as giving up my autonomy.
We can also spend money on whatever we want regardless of whether it is sensible.
Our money in the pot for bills and savings, anything left is our own to spend on what we wish. DH wouldn't dream of telling me what I can and can't spend my money on.
We can go out on the town with whomsoever we wish and sleep with whoever we want.
I do go out with whoever I want - it's not my DH's place to dictate my friendships. Again, the sleeping with people - I've chosen to be in a relationship through my own free will, not because someone has forced me into it. If I wanted to sleep with whoever, I wouldn't have agreed to be in a relationship in the first place.
We can prioritise ourselves every single time and not consider anyone else in most instances. We can decide to move cities at the drop of a hat.
None of that has anything to do with giving up your autonomy, though. I chose to be in a relationship but I didn't choose to give up my free will and my privacy.