Pop Culture Introspection, Part I: Why Do the Couples From The Bachelorette Do So Much Better Than Those From The Bachelor?

 Of the sixteen The Bachelor shows, only four relationships from the show lasted at least a year.  Only two couples are still together.  In contrast, five of the seven The Bachelorette seasons led to relationships that lasted at least a year. (Although only two of the couples are still together.)

Why the difference? Just chance, or does it tell us something about men, women, and relationships?