Folklore medicine used olive oil as an aphrodisiac. The saying
repeated in many olive oil producing areas of Greece is
"eat olive oil and come at night" and this echoes folklore ideas.
On Crete, olive oil which had not been cooked was deemed to
be a much more effective aphrodisiac. A Thessalian saying judges
the fat content of the oil and believes it is an aphrodisiac
(a belief that is held all over Greece) and that butter is a substance
which weakens the sexual desire:

"Eat butter and sleep tight eat olive oil and come at night".
 

Source: Nikos & Maria Psilakis: Olivenöl, die Kultur der Olive, Kreta, 2000