Dating your friend with benefits
While the first pattern underlies friendship, the second underlies sexual relationships.
Romantic love combines the two types of evaluations in a profound and intimate manner.
Furthermore, a significant aspect of friendship that is often lacking in friendship with benefits is that of openness.
Even though these friends might be able to talk about everything else, the no-strings-attached sexual component typically prevents them from being open about their primary sexual relationship.
The partner in a friendship with benefits is often not the first priority of the agent.
The desire to enjoy the benefits of all worlds often diminishes these benefits.
Unlike casual sexual affairs, romantic love is a serious matter.
Friendship is also not a casual relationship--we do not make friends with all our acquaintances.
When there are no restrictions on a person's sexual (and other) behavior, there is no place for making normative inquiries concerning this behavior.
The policy of "no questions asked" applies only to the benefits of a "friendship-plus," but not to its friendship component.
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While romantic love usually involves a similar relative weight to the friendship and the sex components, in friendship with benefits the friendship component is of greater weight, and the sex component is a kind of icing on the cake.