Contrary to some other comments here, it is *not* reliably known that the heart shape represents the silphium plant. It could indeed be that way. However, it also might represent some other plant part; possibly a fig leaf; which is also associated with sexuality by way of the Adam & Eve legend.
However, [there are also premodern representations of the heart symbol with an aorta,](https://en.wikipedia.org/wiki/Heart_symbol#/media/File:Sacr%C3%A9-Coeur_K%C3%B6ln.jpg) suggesting that it was intended to represent the anatomical heart.
https://en.wikipedia.org/wiki/Heart_symbol
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