It’s evocative of those things for sure. There’s also the theory that the heart symbol is shaped like a mildly poisonous seed that induced infertility. This might be a myth though, as the plant doesn’t exist today.

The heart symbol may also actually be a simplified representation of a real heart. A heart is a complex shape that you alnost never see. If priests can be so bad at drawing cats, I can totally believe that the heart was simplified so much.