I asked my zombie friend and they replied THE BRAAAAAIINNNNN.
But yes! The Ancient Egyptians thought that the heart was responsible for love, as well as thought in general. They believed that a heavy heart meant someone lived a bad life – when people entered the underworld after they died, the god Anubis weighed the heart and if it weighed more than the feather of Maat, it was eaten by a monster! The ancient Chinese also believed that the heart was the seat of the soul. The Roman doctor Galen thought that the heart was the seat of emotions, the brain the seat of reason, and the liver the seat of passions.
In fact, all thoughts come from the brain, including love. However, emotion can be affected by chemicals called hormones made around the body, including the heart (however, the heart’s hormones are only really used to control your heartbeat). Testosterone and oestrogen are what controls whether people look more masculine or feminine, and might make people more likely to want to have sex.
EDIT: Aaaand my amazing sister says –
“BOTH!