The Chinese word for “heart” 心 comes from a penis

Precursors of 心 from  http://hanziyuan.net. The penis is the real source of male emotion.

The precursors of 姦  “adultery, wicked, debauchery” make it clear that the heart character 心 really comes from a depiction of a penis (see arrows). Note how similar the character’s substructures below resemble those characters above.