Sex can be the result of love, but never the cause of it.
Has anyone ever really fallen in love—true love—because the sex was good? I personally think not. However, sex can result from, or follow, the establishment of a satisfying relationship based on more substantial foundations: trust, emotional intimacy, commitment, etc. This aphorism is designed to dissuade any individual from thinking that their attraction to another person, if it is based on sex, is more than it really is. Perhaps with such a realization, the individual might avoid making decisions and/or commitments that would most appropriately be made only in the context of meaningful love.