Yip Reports Three Major Factors Contributed to This Relationship Category

Yip reports three major factors contributed to this relationship category: natural progression, dissatisfaction with certain aspects of the partnership, and desire for sexual experimentation:

A) couples who expect the partnership to be sexually exclusive and are behaviorally so.
B) couples who expect the partnership to be sexually exclusive but are behaviorally non-exclusive.
C) couples who expect the partnership to be sexually non-exclusive and are behaviorally so.
D) couples who expect the partnership to be sexually non-exclusive but are so far behaviorally exclusive.