Difference between eat a bread and a person?

"Comer" in portuguese is eat.

Ex:
Eu comi pão.
I ate bread.

In a coloquial way, when the verb is follow for an animated substantive, it means "fuck".
Ex:
Eu comi ela.
I fucked her.

I know there is the same in German, but is a particular verb used for eating something sweet. So, the concept is the same...