tradition

Source: Ancient History Encyclopedia, "Theogony" translation by Raoul Schrott (2014) © 1kilo

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movie theater

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marriages

Source: Research Group Weltanschauungen in Germany © 1kilo

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Gifts

Source: Statista survey © 1kilo

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Online dating sites

Sources: OkCupid, Cupid.com, CupidMedia with sites like ThaiCupid, GayCupid, BlackCupid (Amor is Cupid in English) © 1kilo

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rock bands

Sources: Bands of significant size with names that refer to Valentin © 1kilo

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Shakespeare works

Source: own evaluation © 1kilo

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holiday

Source: Parship survey © 1kilo

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painting

Source: 118 works of art in public collections in the US and UK from 1500-1990, which according to the Getty Provenance Index show the respective figure © 1kilo

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