Its a dating philosophy.
Perhaps it is even a life philosophy.
When you are not fully committed to it, why just drag on?
If your date is not that into you, why still waste time and energy?
Only if you both say fuck yes, you will invest time and effort, and then it will not be a waste.
Only if you are fully enthousiastic, you will say fuck yes.
And this can also be translated to stuff in daily life, i believe (not even only dating stuff)
It is a life philosophy. It is easy. It sounds so logical. Lets try to live like it.