Hrm, looked it up out of curiosity... §218a lists that it is not a crime under certain circumstances ("Tatbestand des § 218 ist nicht verwirklicht, wenn"), but

Hrm, looked it up out of curiosity... §218a lists that it is not a crime under certain circumstances ("Tatbestand des § 218 ist nicht verwirklicht, wenn"), but the heading of that one is "Straflosigkeit", so "no punishment". IANAL but this reads like it is not a crime under the listed conditions. Which is different from no punishment.