It's found in the leaves, flowers and seeds of many plants, including silphium, which was used for birth control in the Middle Ages and perhaps is the reason why the heart became associated with sex and romantic love.
Banyak ditemukan di daun, bunga, dan biji banyak tanaman, termasuk silphium, yang dipakai sebagai pengendalian  kelahiran di pertengahan abad dan mungkin adalah alasan mengapa hati diasosiasikan dengan hubungan seksual dan cinta romantis.