Is there a slut gene?

Wilt Chamberlain, who claimed in his autobiography
to have slept with 20,000 women

Susan Donaldson James reports for ABC News that, in what is being called a first-of-its-kind study, researchers at Binghamton University, State University of New York (SUNY) have discovered that about half of all people have a gene that makes them more vulnerable to promiscuity and cheating.
     Those with a certain variant of the dopamine receptor D4 polymorphism -- or DRD4 gene -- "were more likely to have a history of uncommitted sex, including one-night stands and acts of infidelity," according to lead investigator Justin Garcia.
     Even if the claim of Wilt Chamberlain* was true, he would probably be only a runner-up to Genghis Khan, the daddy of all womanizers, who has been estimated by the Russian Academy of Sciences to have 16,000,000 male descendents living today, meaning he fathered (sired might be a better word) hundreds, if not thousands, of children. By contrast, Giacomo Casanova, according to his biography, only slept with 122 women — doubtless a slacker compared to Warren Beatty, Gene Simmons, Hugh Hefner, and Ian Fleming.

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*From Wikipedia: Swedish Olympic high jumper Annette Tånnander, who met [Chamberlain] when he was 40 and she 19, remembers him as a bona fide pick-up artist who was extremely confident yet respectful: "I think Wilt hit on everything that moved...[but] he never was bad or rude." Many of Chamberlain's personal friends testified that he had an eleven inch penis that sometimes fell out of the leg of his shorts during games, once had 23 women in 10 days, had no problems organizing a threesome (or more), and particularly enjoyed a TV skit on the show In Living Color in which a mother and her daughter approach a Vietnam Wall-like list of women who slept with him, both of them pointing out that their names are on it