Some porn actors have gotten in via a hot girlfriend that will only work with them. The director in order to film said hottie must accept her choice of stud. After the director sees that he is a competent woodsman then he can branch out.
When a woman says it, guys hear a confession. A heads-up. A scheduling conflict.
Here's the translation: I don't feel anything. Right now. With you.
Watch what happens when a man triggers actual attraction. The busy career, the recent breakup, the "not in a place to date" — all of it evaporates instantly. The same woman who was guarding her freedom is suddenly free every night.
The "22 Rules" explain why. When the right switches flip, her timeline rearranges itself around you.