The earliest record of the heart shape and the heart representing love is a French manuscript “Romance of the Pear” [https://en.wikipedia.org/wiki/Roman_de_la_poire](https://en.wikipedia.org/wiki/Roman_de_la_poire) .
However, it’s unknown if this is the origin of heart shape and hear representing love or if it’s just the earliest surviving example.
There is no one explanation really. Some stories suggest it’s modelled after the shapely behind of a woman. Two buttocks descending into the point of the vulva.
Other stories point out that the seedpod of a plant that used to be employed as a contraceptive drug looks like a heart. So an association with sex led to an association with love.
The same shape shows up even earlier with an association to fertility rather than love. Often intended to depict plant leaves rather than a human heart (as the seat of emotions).
At any rate, there isn’t one correct answer. Just a bunch of theories.
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