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Here is an excerpt on this from the GradeSaver site,
"Friendships based on pleasure can vary in their duration. With regard to lovers, the friendship often fades away after the prime of youth is gone since the sight of the beloved no longer brings pleasure. Yet if the lovers are alike in character the friendship may last much longer. Love-affairs based in what is useful are even less-enduring than those based on pleasure. Only the friendship of good men is not harmed by slander. True friendship is that between good men just because they are good; all other friendships are only called friendship by analogy."
This whole page pertains to your question so just follow my link,