The 
would enable a woman to assess a man's level of commitment, detect the existence of prior commitments to other women or children, and simultaneously signal to the man her sexual fidelity.
Without evidence it’s like saying “trust me bro” you need evidence to support your claims and strengthen your argument.
Answer:
The NS eventually becomes a conditioned stimulus (CS).
Explanation:
In classical conditioning, a conditioned stimulus can be defined as a neutral stimulus that has become associated with an unconditioned stimulus and, eventually, begins to trigger a conditioned response. A classical example is ringing a bell (NS) at the same time you offer food (US) to a dog. The dog will salivate (UR) because of the food, not because of the bell. However, if you repeat this several times, eventually the sound of the bell will go from a neutral stimulus (NS) to a conditioned stimulus (CS). It will begin to trigger the now conditioned response of salivation (CR), even if there is no food.
