„No practical biologist interested in sexual reproduction would be led to work out the detailed consequences experienced by organisms having three or more sexes; yet what else should he do if he wishes to understand why the sexes are, in fact, always two?“

—  Ronald Aylmer Fisher, buch The Genetical Theory of Natural Selection

Preface, p. ix.
The Genetical Theory of Natural Selection (1930)

Übernommen aus Wikiquote. Letzte Aktualisierung 22. Mai 2020. Geschichte
Ronald Aylmer Fisher Foto
Ronald Aylmer Fisher
Genetiker, Evolutionstheoretiker und Statistiker 1890 - 1962

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„Do you want to have sex? I think we should have sex. CASUAL sex.“

—  Bryan Lee O'Malley Artist 1979

Quelle: Scott Pilgrim, Volume 6: Scott Pilgrim's Finest Hour

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„Physics is like sex: sure, it may give some practical results, but that's not why we do it.“

—  Richard Feynman American theoretical physicist 1918 - 1988

Does not appear to be from any of his books or cited in a biography. A Google Books search shows that the oldest book citing "physics is like sex" is Scary Monsters and Bright Ideas (2000) by science broadcaster Robyn Williams. On p. 44, this book claims: "Einstein said, 'You do not really understand something unless you can explain it to your grandmother'. Richard Feynman added, 'Physics is like sex: sure, it may give some practical results, but that's not why we do it'." Given that Einstein didn't really say the former, it's likely that Feynman didn't really say the latter.
Disputed and/or attributed
Variante: Physics is like sex: sure, it may give some practical results, but that's not why we do it.

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„So the gay community said, "He's comparing gay sex to incest and polygamy, how dare he do this," and they have gone out on a, I would argue, jihad against Rick Santorum since then.“

—  Rick Santorum American politician 1958

Campaign stop in Spartanburg, South Carolina, 2011-08-26, quoted in * Santorum: Gay community on 'jihad' against me for stance on marriage
The Hill

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