Daphne and Daryl Have Had a Friends with Benefits Relationship

Multiple Choice

Daphne and Daryl have had a friends with benefits relationship for most of their senior year of college. Despite the enjoyment they get out of this relationship, they are in agreement that the sexual aspect of their relationship is only temporary and that once they graduate it will likely end. What rule for friends with benefits relationships are Daphne and Daryl following when they make sexual intimacy a temporary feature of their relationship?

A) emotional rules
B) friendship rules
C) permanence rules
D) sex rules