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Vanity, revenge, loneliness, boredom, all apply: lust is one of the least of the reasons for promiscuity.

Mignon McLaughlin (2014). “Aperçus: The Aphorisms of Mignon McLaughlin”, p.111, BookBaby
Vanity, revenge, loneliness, boredom, all apply: lust is one of the least of the reasons for promiscuity.