Why, According to Estes, Do Communications of Consent, Concern, and Desire

Why, according to Estes, do communications of consent, concern, and desire about sex not necessarily have to be direct, explicit, and specific?

A) It is best that partners sign a legally binding contract to establish reciprocal consent, concern, and desire.
B) Explicit forms of communication can detract from the sexual or romantic nature of a sexual interaction.
C) Communications of consent, concern, and desire do not have to exist as long as partners love each other and are in a stable romantic relationship.
D) More subtle forms of communication can also lead to partners having reasonable conscientious belief that reciprocal consent, concern, and desire exist.