Is it really true that the primary thing we want from a relationship is sex? Yes we want sex but what about companionship, a fellow traveller, someone to love and be loved by? These maybe harder to achieve but I think these are things people are 'primarily' looking for in relationships. Cheap sex isn't that hard to find, and for most men at least, sex alone is not enough to justify the effort involved in a relationship. I suspect the same applies with at least equal force to women.
