It's really not so much how they move, or if tey have rhythym (or however you spell it) it's whether they are comfortable with themselves...
I have a guy friend who's prior girlfriend used to drive him nuts that she was always trying to cover herself with a sheet, and she never really relaxed. It's not like he didn't know what she looked like...
It's all about being comfortable with themselves-- and being able to laugh at silly stuff... (farts do happen when you least expect them
)